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If you having problems with your computer make sure your hard disks are running ok by checking out the machines file allocation table these programs below can assist.

Emsa DiskCheck 1.57
Emsa DiskCheck is a freeware dual-purpose utility for disk surface checking--prescan and full disk reading--with real conditions benchmarking. It scans the entire contents of a CD, DVD, or hard drive and shows found disk errors.

http://dw.com.com/redir?pid=10285212&merid=6255388&mfgid=6255388<ype=dl_dlnow&lop=link&edId=3&siteId=4&oId=3040-2086_4-10285212&ontId=2086_4&destUrl=http://www.download.com%2F3001-2086_4-10285212.html

Or

Drive Check 0.9

A program that will show the total available diskspace on your computer. Will add the space of all available fixed disks and show used diskspace. the program is placed in the systray for easy access.

http://dw.com.com/redir?pid=6997460&merid=81812&mfgid=81812<ype=dl_dlnow&lop=link&edId=3&siteId=4&oId=3040-2094_4-6997460&ontId=2094_4&destUrl=http://www.download.com%2F3001-2094_4-6997460.html

However, these work ok but you really should consult a computer technician for protecting your data against possible loss. However, If your going to proceed then perhaps downloading the disk checking software from your hard drives manufacturers website.