Yes, all files on the windows installation disk are important, if they were not, they would not put them on the disk. Check the disk for scratches, and and clean it if need be. try again, and if no go, then do some hardware checks..there is a memtest program, that you can run to test ram, and im sure there is a hard drive tester. if none of that fails, buy a new install disk.
Here is the mmtest program: http://www.memtest.org/download/1.70/memtest86+-1.70.iso.zip download, and unzip, then burn the .iso to a disk, and run it on startup.
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