Smackre

so i go to my friends house to fix hes comp. I run a virus scan and find like 100 infected files. And everthing is runing slower than hell so i figure its the virus. So i tell him its best to just format cuz geting all those infected files off is like a lossing battle and since he has nothing that is realy not easly to get bak then miss well format. So i take hes comp home and im gona format it for him and reinstall all drivers and stuff. I set it up that night and when i go to format it takes literly 50 hours to format a 40 gig hd....And ive formated alot of hd's and non took over about a hour. This is only a 40 gig hd. It should not take over about 30 mins. So what my question is do u guys think the hd is what is the cause of the slowness of the computer. And can the power supply cause the hd to be slow cuz they just changed powersupply about a week b4 this happened.