Any Thoughts?

I just put together a system with an

AMD Athlon 64 3000+
ASUS K8V-SE Deluxe Mobo
512MB Ram
ATI 9600XT 128mb RAM
ATI TV Wonder
WD 160GB ATA HD
Sony DVD+/- RW
Samsung DVD-ROM

When I boot up, it takes about 10 seconds to do all the system checks (even though quick boot is enabled). Then, the hard drive shuts down, the system waits for 30 seconds and then the Hard drive powers back on and windows starts. Once Windows starts, the system works fine and is plenty fast. It seems like I have a wrong setting in the BIOS. Any suggestions? Please emails me at adamcohen@umich.edu.

Thanks,
Adam