Well this is my issue and i just can not figure out why it started to do this. it all started when i bought my new Western Digital Cavair SE ATA 100 HD. i installed it and began to load windows. i partitoned it correctly installed windows fully and did the updates. after the updates i began to install my games, i installed BF2 perfectly fine and then began to install World of Warcraft. in the last cd i noticed that the system froze on mewhen i came back to check on it. i could not move the mouse do ctrl+alt+del or anything so i hit the reset button. then the worst thing happend i heard a "Click" noise coming from my brand new HD. and froze at the Welcome screen of windows. so i tried to restart it about 5 times more and it finally entered windows. (alot of pateince) so i got the diagnostic tool from Western Digital to see if there was an issue with this brand new drive. Found no errors...
i checked the whole system nothing wrong with anything. also put in my old drive in (40gb Westen Digital) and did the same thing but didnt freeze just keeps clicking at times...

Someone plz help me it is getting annoying...

these are my specs-
Asus A7V8X-X
AMD Atholon XP +2000
1.5gb DDR 3200
Nvida Geforce 6800GT 256DDR