I first started noticing a problem when I bought the new World of Warcraft game for my pc.  In-game I would experience what appeared to be lag, where the movements during gameplay aren't completely smooth. But SINCE I run broadband internet and at my friend's house there's no lag I thought maybe it's a hardware problem.  My computer is about 5 years old, it's an Athlon 1.2ghz 384mb ram with a 64mb geforce VIDEO card.  It's not top of the line but it is still better than the minimum requirements for the game.  My first thought was to upgrade the video card.  My friend sold me a ATI 9600 128 mb AGP card, installed and I still experience that same laggish type jerkyness every so often.  I also noticed that when I move my mouse while opening internet explorer or starting a program that it no longer moves smoothly, it will hang for a split second while moving the mouse cursor in circles for example.  I have updated Norton's Anti-virus and run Ad-aware to scan for spyware often so I don't think it's a problem related to that.  I also started having problems running anime avi fansubs and other video files I download.  They have that same hanging/jerkyness mentioned above, makes it look like the cameraman didn't know what he was doing when he filmed.  The only other thing I can think of is maybe needing more RAM?  My friend said upgrading the video card should free up resources not make my computer run worse so any suggestions would be greatly APPRECIATED.  I did read on the forums here about the PCI slot underneath being left empty, I plan on checking that later today.  But if the symptoms could be caused by anything else would be good to know.Ok, first...  Did you set the AGP aperture size to 128MB?  If it's still set to 16MB or so, your gfx card will only be able to use 16MB...  To check/change this, GO into BIOS (Press del during boot), and look around, there should be a setting called "AGP Aperture Size", and make sure it's set to 128.  Also, I want to know, but how high is your CPU Usage when your mouse lags while moving around the screen (Ctrl+Alt+Del, there should be something on the bottom saying "CPU Usage")?  If it's really high, and you're not running much, it may be that some programs are running as background services w/o your knowing.I run ad-aware regularly and have norton's active, is there any program you'd recommend using to find out if hidden programs are running?Are you on XP?  If so, the windows task manager is good enough...  Ctrl+Alt+Del.  And I ask again, did you set the AGP Aperture size?could be anything.........ram/graphics/drivers/overheating...lag because its the net sever..........run diagnostics>>http://www.active-hardware.com/english/misc/sandra.htmlSorry for the delayed response, I work nights so I sleep during the DAY.  Well I checked the BIOS and it's PhoenixBIOS 2.08 and there is no choice for the agp settings besides whether to set your video to PCI/AGP.  Yes I am running windows XP and as far as I can see in the task manager, everything is running that is supposed to be.  Nothing stands out as being a program running that's not supposed to be.