THIS IS VERY FRUSTRATING- NEED HELP- ERRATIC BEHAVIOR

I have an iMac G5 with Power PC processor. I recently installed Leopard OS and an additional 2 GB memory card, so, now my computer is at max operating level. Here are a few weird things happening: there are several Excel spreadsheets on the desktop I use daily. They used to be icons surrounded by a green frame to indicate they were Excel documents, now, they start out that way when the computer boots up but then they change to white documents with XLS and a corner of the page icon is flapped over. Is that what they are supposed to look like in Leopard? Hmm. The weirdest most frustrating thing of all is that when I use Safari to browse or play games on facebook, the computer auto sleeps or shuts down completely. If I use the restart command, iMac just shuts down. When I run disk utility, I get a disk permissions message that states: ACL found but not expected on "Applications/Utilities." What the heck are all of these things and any ideas?

check the disc, does it say something about intel processors or power pc processors?
i never installed mac os on a pc but im doing the best i can to help you.

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