I have a Wacom Bamboo tablet with associated pen and mouse. They work fine with most applications except Gimp. I have also noticed problems while using them with other GTK applications on Windows. Is there any solution to this?
Have you tried configuring your tablet on Gimp?
I'm using it under Debian GNU/Linux right now. But check if there's an "Input Devices" section in Gimp's preferences, this might be there for the Windows version too. There's an option "Configure extended input devices" for special devices such as tablets.