Repair windows without reinstall

I was facing windows system problem due to different reasons. I was also called to fix the problem by friends. A problem even in a single system file due to deletion, corruption or virus infection leads to whole windows system malfunction. Computer may not boot and ask for a new setup or 'file is missing' to boot the computer. If there could be A:\drive, the drive can be formatted making it dos boot disk. Then the missing file can be copied and install in the problem computer. However the practical problem these days is not having A:\ drive or system boot CD creation before hand. We usually, boot the computer with new windows setup and install the whole system. It usually take about an hour and we also have to install other programs.

Sometimes we may repair the system but we have to reinstall the other programs again. To over come this new whole installation problem, I got an option. This works for some missing files. If you experience any file missing in booting your computer, boot your computer with windows boot CD. After booting the computer from CD, it will copy required files for the system. When it finishes copying setup files, a windows will be prompt for different options:

"Repair, new install or cancel"

Here, don't select for new install or repair. Just cancel for the further setup. It will restart the computer. You can take the boot cd from the drive and allow to boot from harddisk. Now, it will boot normal without boot problem or missing files. Goodluck.