I would first make sure to get the latest BIOS. I have a KT7A and I've flashing it monthly since I bought it
Make sure you have good memory. Go get DocMemory at www.simmtester.com and run it for several hours.
Get your hard drive's manufacturer utility (ex.: MAXBLAST) and verify your drive for errors.
Start with BIOS Fail-Safe Default...
I personnaly like Partition Magic a lot (version 5.01 includes a DOS based utility).