PC Problem - any ideas?

[RNL Tiger]

Try plugging it into a different USB port. If you are using an old PS/2 style mouse use an adaptor. Checkout some of the vendor [keyboard, PC...] forums and see if anyone has experienced a similar problem and what the solution was. For example, you may need to "flash" the BIOS so that it recognises the keyboard properly or similar...

If this has started recently after installing new software then try to restore the system to an earlier date i.e. prior to the installation of the software. More drastically, reinstall Windows.

If your machine is under warranty try to get support, if not, hope that one of the above helps - otherwise you may need a new PC as a Xmas present! :)

Hope this helps...