Invisible Hard Drives

Hi,

I’ve just installed quantum hard drives by maxtor into 4 PCs with SiS mobo’s.

Each of them recognises the drive in the bios and as a result in the initial stage of booting up the PC

In windows the drive is listed in the system applet ofthe control panel but dos and windows don’t assisgn it a drive letter.

Anybody know of any quick fixes?