Is your Windows giving you errors and not functioning properly? This usually means that your system files are missing or got corrupted due to some virus. Suppose a virus attacks your computer and you remove it using an anti-virus software, but the virus in fact removes your system files and makes some corrupted without your knowledge, removing the virus is only the first step, but fixing your system files is the most important step. Some people just re-install their Windows because they think it is too complicated to recover System files, but this is not true. Here is the best, quickest and fastest way to check and fix your missing and corrupted system files.
In Windows XP : Go to Start menu and click Run. Type sfc /scannow in the run command and click OK.
In Windows Vista : Simply type sfc /scannow in Start Search and press Enter.
It will now start a full system scan, this process will take some time, so be patient.
It will scan all your system files to see if they are missing or corrupted, if it finds some to be corrupted or missing, it will then ask for Windows XP or Windows Vista(depending on which Operating System you are running the scan) installation disk to recover those files. After the recovery is complete, restart your computer and you are done. It’s that simple !