Problem with Win7 SP1

Hi All,

I have virtual device driver for touch screen which is root enumerated,It
was working fine until Microsoft released Win 7 SP1,
When I install the device driver,it shows *Single touch point
available*(It should show two touch points available not one),
It works fine with PCs which has Win7 and not Win7 SP1 installed,

Any help would be highly appreciated,

Thanks,

Regards,
Vinayaka