Sony Vaio Mouse issues – Touchpad AND external mouses are not working. Driver error. ?

Hi guys. I bought a sony vaio about two months ago. I had it for three weeks when it crashed, and Harvey Norman had it in repair for over a month. I just got it back about a week or two ago, and the touchpad started going crazy – wouldn’t follow the direction I was actually making it go. So my mum bought me a USB mouse, which worked for a few days, but now nothing’s working – I don’t even have a pointer on my screen. I looked in device’s, and my Terminal Server Mouse Driver says the driver is corrupted or missing. Does anybody know how to fix this? I’m sick of having to use tab to do everything… Thanks in advance x