hi all, please help me. i just finished set up a new PC. Here is my new PC spec:

-AMD AM2 4200+.
-Biostar 570 SLi.
-Palit 7300GT Sonic.
-2 X 1G Kingston value RAM 667Mhz.
-Enermax 460W FMAII.

I always have Bsoc blue screen problem while i wanna disconnect my broadband connection. Is it my network driver problem? But i search into Biostar web there is no driver for network. I also facing the USB problem while i try to using my card reader. The error is:

USB device not recognized
one of the USB devices attached to this computer has malfunctioned, and windows does not recognize it.

CAN ANYONE HELP ME TO SOLVE THIS BOTH MAIN PROBLEM OF MY NEWLY PC??? I FEEL WANNA CRY LIAO.......