XPS M1330 Mousepad doesnt work at random times.

I just installed Windows 7 on my XPS M1330, and  when i start up the computer the mouse pad stops working, and i have to restart the computer to get it to work.    I have installed drivers located here: http://support.dell.com/support/downloads/download.aspx?c=us&cs=19&l=en&s=dhs&releaseid=R175658&SystemID=XPS_M1330&servicetag=&os=WLH&osl=en&deviceid=14029&devlib=0&typecnt=0&vercnt=2&catid=-1&impid=-1&formatcnt=0&libid=17&typeid=-1&dateid=-1&formatid=-1&source=-1&fileid=238839   But I still have this problem. Vista came with the laptop originally and I never had this problem,

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