Touch Support Help?

I have a HP tx1000 and I just installed Windows 7. However Windows Media Center doesn't respond to dragging on my touchscreen. I'm forced to tap the little arrows. Any help?

HP Pavilion tx1000
Turion 64x2 TL-58 at 1.9GHz
nVidia Geforce 6150 with 128 MB VRAM
Windows Vista Ultimate SP1 x32; Windows 7 Beta 1 x32

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