Well I had the same problem with my Bamboo Fun and Windows 7 Pro and I've found a "sort of" fix
I stopped the tablet services,
first the: TabletServicePen and second the: TabletInputService
Then I started them again, in the same order! (tried "restart", but this didn't work)
Dont really know if the order has to be the same but this is how I did it.
Since this happens every time I reboot. I have made a .bat file which contains the code bellow. This is very handy since a only have to execute this file instead of typing it manually or go into the control panel... BAT file
1. Make a .txt document
2. Open it and copy/paste the code bellow
3. Save and close it
4. Rename the file to wacom-restore.bat instead of *.txt
5. Select the file and press enter
6. Now should everything be OK, but you have to do this every time you restart the computer!
net stop TabletServicePen
net stop TabletInputService
net start TabletServicePen
net start TabletInputService