Problem with mouse pad(see details)

I have a really weird problem. My mouse pad stops responding just right after i log in my user( during the log in screen it works with no problems). I tried to fix its drivers but it says they work properly.I also tried reinstalling the driver but that didn’t change anything. If I use safe mode the mouse pad works even after i log in.If I connect a USB mouse it works just fine. I have Windows 7 Home premium and my laptop is a Sony Vaio VPCEH1M1E.What can I do?