Major virus on my iMac 27'

If you have too may icons of the desktop, and some of these are folders with lots of stuff in them, this can slow your iMac down. Maybe the game update caused your issues, initially.

Sometimes, application updates can cause havoc with a perfectly running Mac.

Is this a new 27 inch screen iMac?

At any rate, you maybe screwed now because you might have inadvertently installed malware or virusware.

If you still have AppleCare, take to Apple and explain your situation to them.

Who says that the Apple cannot get viruses? The poster in another thread had better read this.

The only issues with malware on Mac OS X has to do with JavaScript .

But Oracle recently has plugged those vulnerabilities.

There are no native viruses in the wild that affect OS X.

Trojans are not viruses and those Trojans that exist on OS X are proof of concept and contain no malicious code to do any damage to OS X.

The only issues with malware on Mac OS X has to do with JavaScript .

Java, not JavaScript. Whether or not Oracle has patched Java, Java is extremely buggy and full of holes for further exploits. It should be disabled in the browser, at least, and only run, with very rare exceptions, on well trusted sites. But even those sites are vulnerable to hacking.

...those Trojans that exist on OS X are proof of concept and contain no malicious code to do any damage to OS X.

Complete nonsense. There are real OSX Trojans. I will try to give you the benefit of the doubt and suggest you meant viruses, where you used the term Trojans.

I won't bother to post the full list here (I did at first, but have since deleted it), but there is a full catalog of OSX malware, including Trojans, from Apple's own XProtect catalog.

Message was edited by: WZZZ

If you have too may icons of the desktop, and some of these are folders with lots of stuff in them, this can slow your iMac down.

That is actually no longer the case, and hasn't been for some time. Once upon a time, each icon on the desktop was represented as a separate window, internally, and this caused problems with performance problems as more icons were added to the desktop. This is no longer how those icons are drawn, and the performance problems caused by a crowded desktop are no more.

The only issues with malware on Mac OS X has to do with JavaScript .

But Oracle recently has plugged those vulnerabilities.

You are confusing Java and JavaScript. JavaScript is not a problem.

Trojans that exist on OS X are proof of concept and contain no malicious code to do any damage to OS X.

This is absolutely not true! I would refer you to my Mac Malware Guide... specifically, the Malware Catalog which lists all Mac malware that I'm aware of.

Yeah,

I meant Virus not Trojan. I was thinking about something else.

Yeah, Mac OS X has has a few Malicious Trojans, though.

The one that affected Adobe Flash. FlashBack. And the Trojans that are still popping up from within Java.

Apple just recently, I believe, release a Java security update that allows Java to be reactivated by default.

The last couple Java updates deactivated Java by default and you had to reactivate it if you needed it.

Flashback and the other malware that has used Java exploits are technically not trojans. They install behind the scenes, with little to no user interaction. (Flashback was known to request an admin user password, but even if you didn't provide one, you were still infected.) That is not the way trojans work. Flashback also did not affect Adobe Flash... the variants of Flashback that made the news were in no way related to Flash. (The malware had that name because it used the same code that was used in an earlier trojan, which pretended to be a Flash installer.)

As for security updates, Java is inherently insecure and should not be used in the web browser. See:

http://www.thesafemac.com/java-is-vulnerable-again/

I think it's a virus. My daughter's 2-year-old Macbook Pro suddenly started doing the same thing today.