If you keep having problems with a clean install it points to one of two things.....
.
1) a hardware fault
2) you're doing something wrong
Check your RAM with Memtest86+ -
www.memtest.org
Check your HD with the manufacturer's test utility
Reseat all cards, etc, and disconnect all unnecessary devices for the install (just have one HD connected)
Check your Power Supply - has it got enough oomph?