|You may have a failing hard drive or one or more bad RAM modules in your PC. Either can cause data corruption.|
You should test them.
Test hard drive with DOS diagnostic software which loads from a bootable CD.
Try SeaTools for DOS: http://www.seagate.com/gb/en/suppor...
Test RAM with Memtest86 which also loads from a bootable CD:
For both testing tools you can create the bootable CD from CD image using ImgBurn: http://filehippo.com/download_imgburn
message edited by phil22