Hi welcome to the forum

The laptop will have some software loaded on it for the keyboard and mouse this might be causing the problem or may be you have sticky keys turned on you can try turn it off by pressing your shift key 5 times. Another thing to try would be to stop all startup items from loading to see if it one of the programs playing with it you do that like this
How Disable the Startup Group in Windows XP ( WINXP )1) Click on "START" then "RUN"
2) Type "MSCONFIG" and click on "OK"
3) Click on "STARTUP tab", now remove the tick from all " ITEMS" and click "OK" when you reboot the start programs will be disabled.
