The application called VirusScan that comes preloaded on the macbook will no longer open, claiming that it is corrupt and that I must reinstall it.  After looking in the app store it does not appear that said application is available for re-downloading.

The application called VirusScan that comes preloaded on the macbook will no longer open, claiming that it is corrupt and that I must reinstall it.  After looking in the app store it does not appear that said application is available for re-downloading. Is there a special, non-app store place where I am to go for this?
Also, I installed MacKeeper about two-three months ago and am questioning its performance. Looking for input as to whether or not this application helps or hinders my system.

I'll back up Csound on the MacKeeper thing.  In fact, I actually wrote the following about it:
http://www.reedcorner.net/news.php/?p=245
Remove is ASAP.  Do not use the provided uninstalled, as there are widespread reports of pop-ups advertising MacKeeper on your system after incompletely removing it.  Try this:
http://applehelpwriter.com/2011/09/21/how-to-uninstall-mackeeper-malware/
As for VirusScan, Barney is right on the money that it does not come preinstalled on any Mac shipped new from Apple.  However you have gotten it, your best bet is removing it.  See my Mac Malware Guide for more information that will help you understand and avoid Mac malware without relying on anti-virus software.
http://www.reedcorner.net/guides/macvirus
(Note that my pages contain links to other pages that promote my services, and this should not be taken as an endorsement of my services by Apple.)

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