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When I start playing any game, being online or not. After 5 - 10 mins of playing, I begin to lag. The FPS would go from 60fps to 12fps. I scanned for viruses, spyware, cleared out my temp files and so on.
I did run a disk check last night but have yet to check it this morning.
Does anyone know why my computer starts to lag while playing any game, but does not lag when I'm surfing the net.
I also checked my memory usage, no memory spikes, and also checked my CPU usage, no spikes also.

What video card do you have?
I dont think its an internet problem since you can play offline games and it still happens. I would download the latest drivers for your video card (uninstall the original drivers if you can) then once they are installed check it out.
Is this something that has JUST started happening and has been fine before? Anyway good luck
ASUS A7N8X-E Deluxe Mobo
AMD Athlon XP 2800+
1gb DDR400 Ram.
Geforce 6800 LE overclocked.
400-450W Power Supply?

My card is NVIDIA GeForce 7300 GT.
Yes this just started last night. I was always able to run any game on high settings with no lag at all.

More info on my PC :
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 5200+, MMX, 3DNow (2 CPUs), ~2.6GHz
Memory: 2046MB RAM
Card name: NVIDIA GeForce 7300 GT
Manufacturer: NVIDIA
Chip type: GeForce 7300 GT
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0393&SUBSYS_C4473842&REV_A1
Display Memory: 512.0 MB

All i can say for your pc is wooooooooooooooooooooooooooow nice specs and theers probably something wrong with your harddrive your videocard

The 7300GT is not a good gaming card. That doesn't explain the drop in frame rates, but I'm surprised you can even hit 60 FPS with it. What game(s) are you playing?
Here's what Tom's Hardware has to say about the 7300 in an article about the GeForce 7 series:
"One card we left out of the test group is the GeForce 7300, as we do not consider it a gaming graphics card. It only has four pixel pipelines on the GS model and eight on the GT. Clearly, the eight pipeline card is capable of some gaming, but not under the stress of current and future titles. You cannot, for example, play at higher resolutions or enable image quality settings with the eight pipeline card. The four-pipeline card is out of the question, but another limitation is that not all of the GeForce 7300 models have a 128 bit wide memory interface. GS model cards only have a 64 bit wide bus, while only some of the GT cards have a 128 bit interface
Lastly, this card can also come with TurboCache, which might only have 32 MB of physical graphics memory while sectioning off a portion of your system memory for its needs. That is not a performance proposition as graphics data has to run across a slower bus and wait for slower RAM. We feel that these cards are best suited for an entry level gaming system for older titles...."
http://www.tomshardware.com/2006/07...
Would you card happen to be a TurboCache model?

No, the cards not a TurboCache model.
The games I am playing at the moment will be, World of warcraft, Battlefield, C&C3, The movies.

The eVGA 7300GT 512MB can be found for about $60...hopefully you didn't pay much more than that?
"Does anyone know why my computer starts to lag while playing any game, but does not lag when I'm surfing the net"
Sure, because when you're surfing the internet you're not stressing the card. You can easily surf with an old 8MB card...you definitely don't need 512MB for that. As a matter of fact, you don't need 512MB on a 7300GT.
Here's a FPS comparison of various cards. I picked the 7300GT vs the 7600GT in Battlefield 2142. The 7300GT averages 18FPS:

Thank you everyone for the problem, out of everything it was a heat problem with my videocard fan shorting out. I went out and picked up a NVIDIA GeForce 8800 GTX so mmMMmm its ok now :D

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