I have a 27in. i5 2011 iMac. Since downloading mountain lion, I can't print or scan, using an Epson AIO Artisian 835, plus I can't do upgrades. and of course I lose wi-fi. I think if I could do upgrades, I could fix the print/scan problem. Any ideas?

I've had several problems since downloading Mountain Lion. As with many others, I lose wi-fi on wake-up. I've also lost my ability to print or scan and I can't do upgrades. If I can't fix these issues, can I uninstall Mountain Lion and go back to Lion?

What is wrong with your Mac?  You still haven't told us what the problem is. Is the computer still under warranty or Apple Care?
the next time i attempted to use the computer it wasn't fine
What do you mean by "wasn't fine".  We can't see your computer so you'll have to describe what your're experiencing in detail without the editorializing.
Download and run Etrecheck.  Copy and paste the results into your reply. It's a diagnostic tool that was developed by one of the most respected users here in the ASC to help identify the more obvious culprits.

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