When I'm tinkering with CMOS/BIOS setup, my PC has no problem recognizing my USB optical mouse. However, once I'm in DOS, I can't use it. I've tried "hidusb.sys", "ohci.exe" and "uhci.exe" to no avail. The first freezes the PC while booting and the last two eat memory like crazy. I just want to be able to use a USB mouse with enough conventional memory left to run something. Any ideas are appreciated. Thanks in advance!