Not an unwise decision to make. In some instances an infection may have caused so much damage to your system that it cannot be completely cleaned or repaired. Wiping your drive, reformatting, and performing a clean install of the OS or doing a factory restore removes everything and is the safest action. So you will be good now.
Reformatting a hard disk deletes all data. If you decide to reformat, you can back up all your important documents, data files and photos. The safest practice is not to backup any autorun.ini or .exe files because they may be infected. Some types of malware may disguise itself by adding and hiding its extension to the existing extension of files so be sure you take a close look at the full name. After reformatting, as a precaution, make sure you scan these files with your anti-virus prior to copying them back to your hard drive.
If you used a Flash drive to copy any files.Download and Run FlashDisinfector
Please download Flash_Disinfector.exe
by sUBs and save it to your desktop.
Note: As part of its routine, Flash_Disinfector will create a hidden folder named autorun.inf in each partition and every USB drive that was plugged in when you ran it. Do not delete this folder...it will help protect your drives from future infection by keeping the autorun file from being installed on the root drive and running other malicious files.
- Double-click Flash_Disinfector.exe to run it and follow any prompts that may appear.
- The utility may ask you to insert your flash drive and/or other removable drives. Please do so and allow the utility to clean up those drives as well.
- Hold down the Shift key when inserting the drive until Windows detects it to keep autorun.inf from executing if it is present.
- Wait until it has finished scanning and then exit the program.
- Reboot your computer when done.
Please take a moment to read quietman7's
excellent prevention tips in post 3 here
Click >>>> Tips to protect yourself against malware and reduce the potential for re-infection: