I run a windows XP (SP2) desktop, it is about 2 years old.

Intel(R) Core(TM)2 CPU 4400 @ 2.00GHz

So instead of reinstalling my windows, I used repair which just restores the system. After repair, my pc runs very fast, but after using it for a few days, it starts gradually slowing down until it reaches a point where even typing or moving my mouse is laggy. However, this only happens when im multitasking on my windows. If i end all the big processes (antivirus, downloading programs, MSN, etc.), then my computer runs normal again. Another thing i’d like to mention is when im watching a youtube video and I try to open a program, it lags insanely bad for a short amount of time. When I watch a video, even if its loaded, it still lags. I do not use my PC 24/7 but sometimes I leave it on, for downloads. My CPU usage is not necessarily high when my computer is lagging so its probably not a RAM problem. I also have over 50% of free disk space on all local disks.

My PC does not have any viruses, I use Rogers Online Protection, and i am not experiencing any other difficulties except for multitasking slowdown. I’ve tried many things already, I’ve tried to cancel windows updates, stop using anti-virus, I’ve checked all my running processes (searched them on internet) and they were fine, I’ve recorded all the running processes of when my pc was slow and i’ve checked them after repairing my windows. None of these solutions worked. Is this happening to anybody else? Is my PC too old? Could it be a hidden virus? Should I stop downloading and see what happens? Is this a case of software or hardware?

I don’t want to use my computer without being able to download and use the internet at the same time, or cancel antivirus. And I don’t want to repair it every few weeks/days. I am not a pro at these kind of things, so plzz help!

Basically I want to get rid of everything I don’t use or need, but so many things are interconnected that I don’t know what I can and can’t get rid of. Plus I want to completely rid my computer of adware, spyware, etc. Some of that stuff I just can’t get rid of. What should I do? Or what is a reasonable price to pay someone else to do it?

ok. so i did some looking around. and downloaded some programs. and so far i have tried avast antivirus, avira antivirus, and avg antivirus and have come up with no virus results. i have also tried some spyware programs and have not had any spyware threats on my comp. i have tried to use glary utilities to clean my registry and remove junk files . this makes it worse. i have used ccleaner and that did absolutely nothing. have defragged my system even tho it said it didnt need defragged. and have advanced windows care installed.

some people have told me that the problem with my computer is that i download and install too many programs and have too many things running in the background. i have since uninstalled a lot of programs and have had no improvement.

is there anything short of reinstalling the OS, that i can do with my computer to clean up junk files, or find what the problem is? right now it takes 5 min to open a new tab in firefox. and i have maxed at 3,000 page faults/s

which run on same DSL and is working fine. I tried many things (clearing history,clearing temporary files,system recovery,scandisk,safe mode,congfiguratin with last goods ect) but nohing worked.Recently I reinstalled the operatng system(window XP)but still computer is slow. Anti virus programe is same for all the computers in the house and seems to be woking fine.Someone is solicitating on the internet to pay for Registery Clean up for corrupted file?Can some one tell me how this is doen remotedlely and will it help? Any oher sugesion? I will aprecitiate.