Do you have some nagging computer problem, but don't know what it is? Looking for a way to solve it without spending $50 on a first aid or crash protector program? The easiest way to check for glitches is by using a standard feature on every Windows PC: a simple program called ScanDisk.

You probably remember seeing the name ScanDisk before. It's that annoying program that comes up after your computer has crashed.

Don't associate ScanDisk just with computer crashes, though. This program is helpful in detecting computer problems even when everything seems fine by performing six different checks. It never hurts to check.

Ready to find out if your computer is problem-free or problem-laden? If so, there are two ways to access ScanDisk. You can either use Windows or go through DOS.

Sometimes in Windows other programs are open, such as virus protection programs and crash protectors, that do not allow ScanDisk to run properly. That's why it's better to run ScanDisk in DOS.

To use DOS to run ScanDisk, first go to "Start," then to "Shut Down." Choose "Restart in MS-DOS mode." You will be put in the DOS prompt, and the screen will most likely say "c:\windows." Once there, type in "scandisk." ScanDisk will then open up and begin to run.

Keep in mind that when you use DOS you can't use your mouse. Instead you must use the keyboard for all actions. You can use the arrow keys and "Enter" to navigate through the prompt.

While the program is running, you can read about the six tests ScanDisk performs under "More Info." These tests include the media descriptor test, the file system test and the file allocation table test.

The surface scan test is the sixth test ScanDisk performs and an optional one. In this test, the surface of your hard disk is scanned for viruses and physical problems. This test is takes about 25 minutes to perform. I recommend performing the surface scan test at least once to make sure there are no physical problems with your hard disk.

Once ScanDisk has completed its tests it will report and automatically fix any errors. ScanDisk will then save a report of the test if you request it.

Once this is complete, you will return to the DOS prompt. To re-enter Microsoft Windows, type in "win".

If all of this is too complicated and you still want to run ScanDisk, you can easily do so without leaving Windows. Just go to "Start-Programs-Accessories-System Tools-ScanDisk."

Once there, you will have the option of either the standard test or the thorough test. The only difference between the two tests is the thorough test performs the surface scan explained earlier.

Good luck detecting problems, and let me know how using ScanDisk turns out for you. Also, e-mail me your computer questions and I will answer them in this column.

Next week I will review various free MP3 players, explaining features such as ripping songs from CDs and creating playlists.