Hello, please help me. I have been trying for 4 hours with no success

After I boosted from my Vista 64 bit Home CD, I tried to format my disc( due to virus). INSTEAD HOWEVER, it restarted my PC.

The next TIME, I deleted the whole C drive and tried to install Vista,
But the installation process would not go past the "expanding files" part ( the part after copying files).

After a while being stuck at expanding files, the screen will go black and remain that way. I have to turn off the PC power supply and repop in my disc in order to restart properly.

I have tried formatting the C drive, even though it was blank.


Thank You.
- Dissevered

Edit:

It takes QUITE a while for the PC to get to the Enter PRODUCT key part. It dwells a long time before with the Mouse clicker and an entirely blue screen.

The PC sometimes goes black screen even before the Expanding files part, forcing me to restart. bump1) Boot to a boot time AV and scan the drive to eliminate any lingering viruses.
2) Then boot to your OS DVD and begin the install process. Delete any and all partitions, create the new partition(s), format, and install.