Installation of Mountain Lion will not initiate on MB Pro 15", late 2008.

I am trying to install ML on my MacBook Pro, currently running Lion with all the latest updates. Configured with 4 GB Ram. I get a message that says:
Could not find Installation information for this machine. Contact AppleCare.
I inherited this computer from a colleague who went in search of greener pastures and he left me no history of computer performance or support. The computer has been working flawlessly since I got it over a year ago. One thing I know about it is that he did not purchase AppleCare and if he had it would be expired by now. Universities are frugal and do not like to purchase things like hardware/software support.
Can someone tell me a work-around to get Mountain Lion to install?

Press Shift key on boot and open the OS X Mountain Lion installer. If the issue keeps, reinstall Mac OS X or create an USB to install OS X Mountain Lion > http://arstechnica.com/apple/2012/07/how-to-create-a-bootable-backup-mountain-li on-install-disk/

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Also, visit The XLab FAQs and read Detecting and avoiding malware and spyware.
See these Apple articles:
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David,
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[repost from: https://discussions.apple.com/message/19062891?ac_cid=op123456#19062891?ac_cid=o p123456]

Mountain Lion will not download says The product distribution file could not be verified. It may be damaged or was not signed." Help....

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If you have Intego VirusBarrier X6 installed
1. Open /Applications/VirusBarrier X6.
2. Click on the "Surf" button.
3. Click on the "Ad Banner Filter" tab.
4. Click "OFF" next to "Banner advertisement filter".
5. Start the computer in Safe Boot, then restart the computer into normal mode.
If don't not have Intego Virus Barrier installed
1. Verify that the date and time is correct on the computer.
2. Safe Boot once, then restart normally, then try downloading again.
3. Try with a different user account if the issue persists
If the issue persists
Install Lion onto an empty partition (internal or external).
Note: You can Use Disk Utility to live partition the internal drive and create a second partition large enough to install Lion.
Start from the clean installation of Lion.
Download Mountain Lion from the Mac App Store. Note that the original startup disk can be set as the destination for Mountain Lion during the installation process.

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Purchased Mountain Lion in the App store from my MacBook Pro (early '11 version). All software was updated. Would not download, instead got a window stating that the product distribution file could not be verified, it may be damaged or was not signed. Tried to download it to my iMac and it worked just fine. Also, after NEW updates on my MacBook, Safari will not open.

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Error messages?
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Mountain lion will not download on mac air.

I have a late 2010 mac air, purhcased mountain lion, clicked download and all it does is show me the circling icon at the top of the app store but does not proceed to download it. I can click it as many times as I like but it will not download!! I have restarted computer!! Very frustrating!

Figured it out. Thanks.

Installation of Mountain Lion will not initiate on MB Pro 15", late 2008.

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