I just bought the wacom bamboo pen and touch tablet yesterday. hooked it up, installed program, drivers, etc but now the pen doesn't work. touch works, not pen. talked with tech support twice - 2 diff people - and we tried several things but the pen still doesn't work. it lights up the tablet, but won't move the cursor. tech people say it's something in my pc - not the tablet itself. Any suggestions? I use Windows XP. Thanks.