Help with touchpad

I had to send my Dell Inspiron 1420 off to get the Nvidia Chip replace. They pulled the mother board and fixed it and reinstalled it. When I got it back I had to reload the HD with W7-64 due to wiping it thinking that was the problem instead of the chip. It had XP before if that matters. Now my touchpad will work briefly then freezes for a couple seconds then works for a couple then freezes again. I've tried reloading everything. I tried it in safe mode. When I boot to my W7 cd it seems to work. I've tried running the cd and letting it repair anything it wants but it doesn't help. Maybe they screwed something up fixing the Nvidia chip?? Any ides? Thanks.

This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.