Hi Guys,I inserted a Knoppix CD(from one Magazine) into CD ROM drive,it worked smooth for sometime then my PC got hanged so I tried to eject CD,but it didn't come.Then I restarted my PC,but now if I insert any CD including knoppix, and click on explore,PC gives the message"Please insert CD into D:" I tried shutting down the PC, but same problem.Do I have to change some BIOS setting?What is the solution? or procedure for overcoming this problem? I am new to this,Any help will be greatly appreciated.

My PC configuration[Compaq 3350,Processor-AMD,Windows XP]
Thanks
Prasanna