How to Reformat Windows 7. If a virus or malware app leaves your Windows installation in shambles, you may not be able to repair it with clean-up tools. Sometimes, the damage from malware, viruses ...

In some cases, formatting your PC may be the last resort to remove viruses that can not be eradicated with existing antivirus programs. After reformatting, you can reinstall the operating system and ...

You can format a computer's drive from within the Windows interface except for the system drive. If you want to reformat the hard drive, or C: drive, you cannot do so while Windows is running.