Trackpad problem in Windows 7 (short freezes on every click)

Im running windows 7 64-bit in a late 2010 macbook air.

If i activate both tap to click and draging, every single time i click anywhere the cursor freezes for 1 or 1,5 second. It renders the trackpad unusable and the only way to "fix" it is by disabling draging, wich of course is not an option.

Is it the default behavior? Any way to fix it?