THat may be our problem.
First the simple. Have you forced your iPad to reboot? Hold down the sleep and home keys for 20 seconds or so. When you see the silver apple, let go, let it reboot and try again
You can also try a different USB port and cable if you have one handy
If that doesn't work:
Go into the control panel, add/remove programs
Uninstall iTunes, Apple Mobile Device Driver, Apple Application support
For good measure, reboot your computer, then go to apple.com, redownload and reinstall iTUnes and try again
Sometimes on Windows computers iTunes only thinks it updates the drivers, Uninstalling and reinstalling forces it to update the drivers.