Problem occurred after laptop had gone into sleep mode after I left it on doing a virus scan.Laptop is out of warranty by 2 weeks.
On-screen keyboard works as does keyboard plugged into USB port. Touchpad is fine. Sticky keys window works when I press the shift key on the keyboard but all other keys are dead. Driver appears fine and I have rolled back to the last two restore points without success. I dont know whether this is a software issue or if the keyboard has actually died. The sticky keys working with the shift key suggests a software issue.
Any suggestions are welcome but please keep them simple as I am not particularly good at these things. I have restored from my USB stick before but that is just about my limits and I don't particularly want to go down this route again as I might end up in a situation where I dont have a keyboard that works to do the job properly.