BSOD On web + running virus scans.

I built this computer about 4 years ago and used it thoroughly for about 2 years. I always had blue screen issues but they were never this quick ( every 3 hours ). Ended up going into the army and it just sat in my room forever. I brought it to Geeksquad because I was having problems with it recently and they did a total reinstall with a new OS ( Home 7 64bit ). Come to find out one my my cards was failing. Get the comp home and I am now having blue screen issues once again. One called BAD_POOL_CALLER and another called NTFS_FILE_SYSTEM. The ntfs happened first.

Windows 7 is...
-64bit
-Not the original OS
-Full retail
-Hardware = 4 years old +/- few months
-OS is 1 day old

EDIT: I am pretty sure this is happening because of a corrupted hard drive. I believe my 300gb is partitioned with my 250gb primary. I tried starting up my computer without the 300gb connected and couldn't get past the load screen because it was saying " Can not find nvidia driver, Make sure hard drive is connected properly " or something of that sort. Yet my 250 has all the drivers on it. Also, when I look under my 'computer', it only shows my primary 250gb and my 500gb one. The 300 isn't even listed.