Mountain Lion not installing - With VirusBarrier X6

I was having lots of problems trying to install Mtn. Lion but was able to install other apps and updates. I just couldn't figure it out! But with lots of support from Apple and searching around I was able to get it to work. I wanted to share to help everyone out!
First off, this only works if you have VirusBarrier X6 (VB)!
1) Open VB and click the tab "Surf"
2) Under "Surf" click "Ad Banner Filter"
3) Turn this OFF
4) Now turn OFF the computer.
5) Holding SHIFT, start the computer WHILE STILL HOLDING shift DOWN.
This will put the computer into Safe Mode. Safe Mode will clear certain Cache files that a user would not be able to normally to clear.
6) Release the Shift key when you see the gray Apple icon and the progress indicator (looks like a spinning gear).
7) Log into your account.
8) Now restart the computer NORMALLY.
9) Go into App Store and you should be able to download Mountain Lion.
I hope this helps!!

You can try this link, it worked for me:
http://support.intego.com/entries/21776831-mountain-lion-download-errors
The last one was what did it, moving the preflight.pfpgk to Trash

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