If so I've seen this when folk installed that BAD logitech keyboard driver.
Repair of that issue is fairly expert and your post tells nothing about what CDs and more so I'm left to guess far too much.
As it stands, with system restore being one option, reinstalling the OS looks like the next option with only this much story to work with.
After my Dell WKSP 390 description flahes up it then goes to Type in password and hit enter. My keyboard commands are not registering on the screen so I can't sign in.It now shows,(after description flashes up) press F1 or F12 to enter setup.After pressing F1 I start hitting F8 for safe mode and it brings up the prompts for safe mode or "Last known good config for windows etc" .If I select safe mode in any mode, ie,"Safe Mode" it takes me back to hitF1 or F12 etc.
Is any one familiar with this problem ? if so please help.
Regards to all..Rob M