When I turn on the pc and I start using it everything works fine, but after being logged on for about 15 minutes my pc acts funny, I can't open any programs or simple files, such as pictures or text files and right click does not function.  At first I thought it would be memory, but when that happens all I have running is 3 ie windows.  From the 3 ie windows that I have opened I close one to see if that changes anything, nothing happens, but when i try to open a third ie windows again, I can't, that and any other program.  I have to restart and that helps for a few minutes, but I get the same PROBLEM again.  Any help, please? 
By the way I use windows vista.Did you try System Restore?
How is your computer security?More info on the machine in question and someone will be along shortly...Yes I've tried system restore, but that didn't help.  I reinstalled windows vista, I did not reformat my system just reinstalled windows vista, but that didn't help neither. Security?  Well, I have Norton antivrus and I RAN Spybot and everything seems to be fine.  Since yesterday I'm getting something new, everytime I try to scroll, the scroll bar stops, it does not freeze it just stops and I have to click on the scrollbar again to keep scrolling.   Another thing, when I have multiple ie windows opened I put one in the back to work on another window, but the one I put behind the other one comes on  by itself.  

Here's some info from my system I obtained using Belarc Advisor:

Operating System  
Windows Vista Home Premium (build 6000)

System Model
HP-Pavilion RX886AA-ABA a6013w
Enclosure Type: Desktop


Processor
3.00 gigahertz Intel Pentium D
16 kilobyte primary memory cache
2048 kilobyte secondary memory cache


Main Circuit BOARD  
Board: ASUSTek Computer INC. LEONITE 5.00
Bus Clock: 200 megahertz
BIOS: Phoenix Technologies, LTD 5.17 04/20/2007


Drives
320.07 Gigabytes Usable Hard Drive Capacity
242.02 Gigabytes Hard Drive Free Space

ATAPI DVD A DH16AYH ATA Device [CD-ROM drive]

Generic- Compact Flash USB Device [Hard drive] -- drive 1
Generic- MS/MS-Pro USB Device [Hard drive] -- drive 4
Generic- SD/MMC USB Device [Hard drive] -- drive 3
Generic- SM/xD-Picture USB Device [Hard drive] -- drive 2
WDC WD3200AAJS-65RYA0 [Hard drive] (320.07 GB) -- drive 0


Memory Modules
1526 Megabytes Installed Memory
Slot 'A0' has 256 MB
Slot 'A1' has 512 MB
Slot 'A2' has 256 MB
Slot 'A3' has 512 MB


Controllers  
ATA Channel 0 [Controller]
Intel(R) 82801G (ICH7 Family) Ultra ATA Storage Controllers - 27DF  



Display
Intel(R) 82945G Express Chipset Family [Display adapter]
Daewoo PnP Monitor (16.3"vis, August 2002)

Thanks in advanced!  I tried to post my hijackthis! log, maybe that could've helped, but the maximum allowed CHARACTER length is 10000  You can attach HJT log, by clicking on ADDITIONAL Options...Ok, thanks, here it is:

[recovering space - attachment deleted by admin]I can see, you're with Vista, so you need to download newer HJT version...
http://www.trendsecure.com/portal/en-US/tools/security_tools/hijackthis/download
Click on Download HijackThis Installer
Ok, here's the log with the new HJT:




[recovering space - attachment deleted by admin]The log is clean. Must be something else.
Did Vista come originally with your computer? If so, do you have any Vista DVD?Yes, It originally came with my pc and yes I have vista disc.Is it Vista DVD, or Recovery DVD?Vista DVD.Try Repair option, as described here: http://www.bleepingcomputer.com/tutorials/tutorial148.htmlOk, I'll give it a try, thanks!