I'm running XP pro on a 300gb hard disk. C drive is 100gb and has windows loaded, D drive is 200gb and has data. Everytime I boot up its asking to run Check disk on the D drive which it has done about 3 times. This has happened before but went away. Now its back again and I'm not sure whats wrong. The pc is running fine, I don't have any viruses or done or saved anything unusual to the D drive.