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!
Code:
net stop TabletServicePen
net stop TabletInputService
net start TabletServicePen
net start TabletInputService
//Best regards
Arre