Hello, I just bought a 1 TB HDD for my Desktop PC. Earlier I had two 250 GB ones. So I exchanged one of them with new 1 TB HDD. I installed Win xp in 250 GB HDD and Win Vista in 1 TB HDD. Both worked for about a month. But, suddenly my comp failed to boot. I found in the BIOS that my 1 TB HDD is shown as 4.1 GB. How shall I correct this problem? Please HHHEEELLLLLLLPPPP !!!