I can't use some software since downloading Mountain Lion. Help?

I can't use Adobe Flash (vers. 8) anymore because it's a PowerPC applicaiton, and I can't log onto the World Community Grid anymore and, when I tried to reinstall the software, I was told that it "can't be opened because it is from an unidentified developer" and that I need to alter my security preferences. I wasn't able to find anything in System Preferences that could help me. Also Spaces has disappeared, and that was an incredibly useful tool for me. Anybody know what I can do? Should I just uninstall Mountian Lion?

Captfred is pointing out a very good thing, which is the middle tier option of allowing only app store and signed developers. This is a pretty good tool and put there for the ease of security.
Although I have experienced some apple software that doesn't have a signed security clearance either
Hence my setting. Keep constant remote backups!
I had a sneaky suspicion you were referring to Flash.app and not just the player. You will also have to get it on there. They offer a 30 day trial period, and with CS6 things are a lot faster and a lot smoother!
I highly recommend anyone to upgrade to the latest line if they are coming from an older version. Things are where you expect them to be and improvements have been made to the way it processes and loads!
Check out Flash here:
http://www.adobe.com/cfusion/tdrc/index.cfm?product=flash

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