yeah konrad i did a similar harddrive test off the hitachi site, made the boot disk, and got a 0x00, should i go ahead and try this one too? i have reasons for why it could be the hard drive still, but there's also the motherboard...
i'll try to explain the long backstory of when I started noticing problems...i'm sure there are a lot of redundant details but here we go:
a while back I tried replacing my amd athlon 2400 xp processor with a new dual core, and when I would play games after a while the fps would drop to a constant 20-fps or somewhere in that range. other apps like video editing progs would then be sagging constantly unless i restarted, and it would be fine again until it sagged after time. i think that's a cooling issue, but out of frustration back then and not knowing what to do i just put my old processor back in and things started running fine again. i started to notice about every 15 minutes or so i'd have these little freeze blips when just doing ordinary desktop stuff. anyway, fast forward to me going through a powersupply and replacing my old graphics card with a new 8800 gts (won from a contest for free yeay). bad game performance starts happening again, but not as bad as before. i was able to somehow avoid the comp lag and games would run fine. fast forward to a few days ago, i noticed that if i joined a source game online, i'd have this constant rubber band lag effect although my ping was still normal. tf2 online was for the most part ok, and if i created a listen server for anything that'd be fine too.
so i figured i was due for a reformat, and i did. if you skipped the last paragraph good enough cause heres the current situation. now ive had problems with programs freezing up or crashing like steam, my game downloads on steam are incredibly slow while my ping stays the same, i'll watch a video on youtube for another example and sometimes it would stop halfway or at another point and think the video is finished although its not and it appears as if the whole thing loaded. images and downloads are the same way - sometimes the full image wont load completely and downloads will say they are done when really they are not. i have to clear my cache if i want to start from the beginning for say videos or images and load them again. i havent tried much other than diagnostic tests yet, later i'm going to try playing something to see what it's like...but what's odd is these problems were triggered by a reformat...and ive had other problems before and again or still...it just makes no sense.