Mountain Lion causing apps not to work, how can I downgrade to Lion without Time Machine Back-up?

Since installing Mountain Lion, I have found applications that don't work. I want to go back to Mountain Lion, unfortunately I had trouble with my Time Machine back up hard drive a couple days after installing Mountain Lion and I don't have any back up to work from. Tried to go to App Store and redownload Lion from there under purchases, but I got message that said "You can’t upgrade this version of Mac OS X because a newer version is installed."
I have another mac that I can download the Lion install package to and then drag it over to this computer, so the question is, Will I be able to re-install Lion over the upgraded Mountain Lion without any problems?

Babowa - By On Screen, I mean it still shows up in the disk utility and reads the following:
MATSHITA DVD-R   UJ-898:
Firmware Revision:    HE13
Interconnect:    ATAPI
Burn Support:    Yes (Apple Shipping Drive)
Cache:    1024 KB
Reads DVD:    Yes
CD-Write:    -R, -RW
DVD-Write:    -R, -R DL, -RW, +R, +R DL, +RW
Write Strategies:    CD-TAO, CD-SAO, DVD-DAO
Media:    To show the available burn speeds, insert a disc and choose File > Refresh Information
There are several links here on the support forums with manyyy others having the same problem: https://discussions.apple.com/thread/4150905?start=30&tstart=0

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I apologize for that, but I was thinking
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If all you did was upgrade to Lion, there's no reason to do anything. All your data, etc., should still be on your Mac, just as it was before.
Please clarify exactly what you did, and what the problem is.

Mountain Lion causing apps not to work, how can I downgrade to Lion without Time Machine Back-up?

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