|Batch files tend to be more safe than a virus. Some way would need to exist to run this shredder.bat file like autorun or registry or startup. |
Why it is there I can't say. Looks like an original file to clean up from some install of an antivirus.
Keep a good security suite on your computer at all times and keep it up to date.
Use a limited user account at all times instead of an admin user account.
Google is evil