sax2 crashes

Hello. If i run sax2 it crashes and i will have to make a "hard reboot". I have a option in my XFree86.conf: Section device ----"---- option "NvAgp" "1" ---"--- without it x will not run. I have just updates my bios. My morherboard is a soltek SL-K8AV2-R nvidia grafikcart The real problem is my logictech usb mouse. I have to set it up after every start of the computer. Can i edid the xfree86.conf manuel .- ehm, and what shall i write then? Regards Claus