Windows boots fine under Parallels but not under Boot Camp anymore...Advice?

Ever since I installed Parallels to boot Windows off the Boot Camp partition, booting into Boot Camp successfuly works sometimes, and other times not at all. What I mean by this is when I restart my computer and hold option, and click Windows, the screen comes up with "Please select the operating system to start: Microsoft Windows XP Professional or Paralles Configuration". Sometimes, I can actually press down on my Mac and select Paralles Config, other times, down (or up, or enter or any other key on my keyboard) will not work at all, forcing me to restart my computer sucessfuly back into Mac OS X. Anyone ever encountered this before?

 

This isn't a Parallels problem. Well Parallels changes boot.ini and sometimes it isn't rolled back properly and you have to select the correct option in the boot screen.

But the problem with the keyboard is related with Apple only. I've face this sometimes when I try to boot Windows CDs.

Disabling any bluetooth device may help. At least it worked for me.