corrupt installation

i was trying to install Mcafee’s Virusscan 6 and during installation the computer suddenly froze and what i had was a blinking cursor. Tried rebooting the machine and the HP logo came but back to the blinking cursor. What could have gone wrong? I have no clus and this the only information i can provide. It would be a real help if i could get some sites were i can check out the problem, as most of it points to a conflict between the OS and Mcafee installation.