Emulator Lag

Hello, I am having a very erratic problem with both GBA and NDS games. Whenever I play a rom in either No$gba or VBA, it starts fine at 100%. But after 30-40 seconds, it starts to lag and runs at 30-40%. This problem did not happen to me when i first bought this pc. It started in about six months after I bought it. What can I do about this? Any help will be appreciated.

You probably installed a program or something that resides in your memory.If you have multiple cores you can try setting 1 core's affinity for your emulator to high and put anything else on another core.

try cleaning your computer out.......you have to if you wanna get your money's worth out of it!!i got mine for $45 and i clean it once a month!! i should probably do that today.........it may help a little.......but also check your memory usage and see what is using up A LOT of mem....

How can a program be doing this after I formatted my xp and scanned my pc with many antiviruses, antispyware and registry cleaning programs. And I set 1 cores affinity to high for no$gba but still not luck.