There are a large number of versions of the file available- and many that you download from the internet will be infected with malware or viruses.
There are also programs which will display false error messages in order to get you to purchase their snake-oil 'upgrades'
You should repost your query in a more appropriate forum - either the System repair forum or the malware/security forum in the Windows Community forums here...
http://answers.microsoft.com/en-us/windows/forum/windows_7