hello, I am having similar issue with my mouse and keybd. using win8:
So, the PC is Gateway FX 4710, 8 gb memory, quad core multimedia pc, installed win 8 last Jan. 2014 -online download. So have no disc.
Now, the wired USB DELL keyboard and the wired Logitech USB mouse don't work.
They work during a small period of Startup. I can access the boot mode and can do changes, but then it stops working.
Changed the mouse to Microsoft intelli wired USB mouse and the kybd. to another DELL wired USB --- all to no avail.
USed another PC - DELL XPS 750 -another multimedia pc, removed the HDD from the 1st PC, installed here. Same problem --- so now i know it is the win8 OS and not the Kybd and mouse.
Big problem: what do i do to get in the system to uninstall USB drivers and re-install????? pls. please advice. I shall truly be grateful. best - sim S.