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Solve : Windows XP debilitatingly slow?

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I'm having trouble with my two-year-old customized system. I do have some limited amateurish experience with Windows - whatever has been necessary for me to enjoy casual PC gaming and some minor troubleshooting through the years. This is by far the biggest problem I've had to face. I apologize if any of this is irrelevant info, I'm not sure what will help and what won't. Thanks in advance for any help.

Here are my system specs (my problem is outlined below):
Windows XP Home SP3
ASUS DVD/CD-R
ASRock Wifi-Motherboard SLI ATX form-factor
AMD Athlon X2 64-BIT capable dual-core processor
4 GB Ram
NVIDIA 9800 GTX+ - 512MB
600 GB Hard drive (~55% free space)
Antec Powersupply

Everything was running fine and dandy, no problems whatsoever until 2 days ago. I said earlier that I've troubleshooted a teensy bit, however it's never been for this system. It hasn't demanded anything until now. I just got a new software game that I was excited to install so I put it in my DVD drive. Before installing I wanted to do a little house-cleaning with my system so I allowed Windows to Update and I downloaded a new version of AVG's free anti-virus software from CNET.com (a free version 2011). I had an older version (version "Free 8.0") which had expired, which I did not uninstall. After the download completed, I allowed it to install which is when I started to notice some slowness. It wasn't much slower than normal - just a little.

When the software said it was finished I tried to enter its interface to customize my virus-protection. When I tried right-clicking on the program in the system tray, no commands would respond except for the "Scan Computer" command. The program also wouldn't respond when I tried to interact with it through the Start menu. I noticed the installation had automatically uninstalled the version 8.0. Irritated by the lack of response by the program, I just wanted to get to my game so I opened up My Computer and tried to click on the DVD icon to install it. By this point my system became what it is right now: ridiculously slow... as in opening Calculator took 4 minutes. I got a Blue Screen of Death somewhere around this time too, something my system has never seen before. Unfortunately the BSOD disappeared before I thought of writing down what it said. The computer also crashed and still crashes willy-nilly.

At first I was convinced it was a virus or malware or something so I downloaded Windows Defender off of Microsoft's website and completed a scan but nothing was detected. I did a system restore to a day before this happened but it didn't help. My internet browsing remains mostly unaffected once I get the program running. My screensaver which uses 3D rendering also remains unaffected. Now I'm thinking this is a RAM issue, MAYBE? (By the way, I just tried calling up Task Manager and then shutting down. They took 11 minutes and 40 minutes respectively.)

At this point I haven't been able to DeFrag because the program freezes (but not my whole system) and stops responding according to Task Manager. Also doing basically anything that uses Windows Explorer (not Internet Explorer but Windows Explorer like "My Computer and Task Manager") ceases to function as soon as I call it up. I've gone into both "SafeMode" and "SafeMode with Networking" and tried using Windows Explorer programs but the metaphorical molasses has spilled onto them too!

Does anyone have any ideas about how I can FIX or at least diagnose what's going on here? I'm all out of my amateur tricks.

Thanks in advance.Quote

I just tried calling up Task Manager and then shutting down.
Next time it's slow, take a look at the processes running in task manager and see if any of them are using up a lot of CPU.

Is your HDD activity light on constantly?There is a practical way to trouble shoot your problem.
To do this, you must have another good working HDD. It can be smaller, even an older model. Let me know if you want to hear more about this sort of diagnostic method.
YES, I noticed you did a system restore. And yes I know you said Windows Explorer is slow. Boot to Safe Mode mode and if AVG is still there, uninstall it.Sorry for the long period between post and reply.

Dahlarbear: I booted to Safe Mode and AVG 8.0 (the older version that I had) was there. I tried uninstalling it through its uninstaller, through the Add/Remove window, and by going to AVG's website where they had last-resort uninstalling software to download. Nothing worked - AVG 8.0 is still on my system. Attempting to uninstall it makes it say "Installation failed!" Under the details button it says this -

Installer initialization failed due to following error:
Error: @AvgErrorCode_0x0253 %FILE% = "D:\Program Files\AVG\AVG8"
@AvgErrorCode_0x0020
Geek-9pm: Unfortunately I don't have another HDD except for my two laptops. Thank you though.

Linux711: My HDD activity light is almost never on except for occasional flickers every minute or so. I've looked at the processes running in Task Manager when it's slow but strangely no CPU is being used and I haven't noticed any processes in the list that are out of the ordinary or that are using an exorbitant amount of memory.


Things have changed in the last week. My computer is no longer nearly as slow and I can open almost any program and it doesn't sweat. The only thing is that my system keeps crashing after about 1 hour or when I'm playing a game for 10 minutes. I always get a BSOD. I managed to write down what the BSOD said:
page_fault_in_nonpaged_area
I looked this up online. I haven't recently installed any drivers that I'm aware. Could my memory be faulty?

Thanks everyone for your help so far!
Quote
The only thing is that my system keeps crashing after about 1 hour or when I'm playing a game for 10 minutes.

This sounds very much like a HEAT issue...
DLoad install and run SpeedFan...
Take 2 readings and post them here...1 under normal usage and 1 under heavy gaming.Patio: Interesting... I downloaded SpeedFan and ran it. You'll have to forgive me if I'm not doing this right as I've never used a program like this before...

Quote
Take 2 readings and post them here...1 under normal usage and 1 under heavy gaming.

The way I'm understanding this, you mean I look at the "Charts" tab on the SpeedFan interface and report what I see visually when I ask SpeedFan to "Analyze Temperatures" of "CPU" and "System". Under those assumptions, here is what I found---

When idle the CPU was approximately 74 (I'm assuming that means degrees) and System was 36.
When I left SpeedFan running while I ran one of my most intensive games CPU was 97-100 and System was about the same at 36-42.


I purchased my computer case thinking it was very attuned to cooling. It has 5 fans although SpeedFan tells me only my CPU fan is running. I can hear all the fans going right now and at all times however...

A few days ago I opened up my case and tried blowing out the dust with canned air. Maybe I'm imagining it but I think my system ran a little longer before crashing. This was the first time I cleaned out the inside since I assembled the thing 2 years ago...

I'll try moving my system out from under my desk and see if I notice any difference.

The posts so far are most appreciated.I think I understand SpeedFan better in the 20 min since I posted. Under the "Readings" tab, it has the burning up logo next to the GPU, CPU, AUX, TEMP, and both COREs. When the CPU is running around 50%, the temps are like those I stated in the previous post. When the CPU is running over 60% its temp is around 106 or 107 Celsius.

A quick look online tells me that my Athlon processor wasn't made to handle over 90 Celsius.

Unless this is a rabbit hole, I think this is the problem - it makes total sense to me. Thank you Patio. Does anyone know what I can do to fix this? The SpeedFan FAQ is hard for me to understand on how to adjust fan speeds.


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