How to Fix a Windows File With Cyclic Redundancy Check

1. Run an error scan to fix errors on the hard drive. Click 'Start,' click 'Computer,' right-click the drive, select 'Properties' and select the 'Tools' tab. The 'Scan Now' or 'Check Now' button will begin the scan. If you get the 'Drive is in use...' message, click 'Yes' and restart. The scan will begin just before Windows starts.Occasionally, ScanDisk will not run when you tell it to. If this happens, use your antivirus software to scan the entire PC for viruses. If that doesn't work, start a command window by clicking 'Start,' typing 'CMD' in the search box and pressing 'Enter.' Type 'sfc /scannow' and press 'Enter.' This will run the System File Checker to replace system files with their original versions.
2. Clean the CD or DVD thoroughly with rubbing alcohol or glass cleaner. An 80 percent solution is recommended because anything lower contains too much water and will smear the surface. Use a cloth that contains no lint, whenever possible. Dab the alcohol on the edge of the cloth and wipe the disc firmly. Keep the motion linear--wiping in a circular fashion could produce scratches and permanently damage the CD/DVD. Wait for the alcohol to evaporate before reinserting the disc.
3. Use a scratch repair or scratch removal system to eliminate blemishes on the disc. An electrical disc fixer may produce better results, but is not recommended for a computer disc. They create circular patterns that make the disc unreadable by most PC drives. Try a liquid one if possible; they won't leave patterns and are cheaper (see Resources). The liquid removers require you to firmly scrub the disc for a specified length of time. When the solution dries, use a tissue to gently buff off the residue.