Make sure they are not set too aggressively. Try resetting to default settings after making a record of the current settings. There could be a resource conflict between two pieces of hardware causing the problem. Watch specifically for problems that are encountered only when a particular device or pair of devices is used. See here for more details .
Strange problems can result from a boot disk volume that is full.
Check your disk space on the drive that contains the Windows directory. Watch out for temporary files that are left-over from earlier sessions and may accumulate in the temporary file directory. These should be cleaned out periodically. If all else fails, you may want to consider reinstalling the operating system. Sometimes, this will fix problems that may have cropped up when an installation is not completed properly or a file becomes corrupted.