Help? iMac has no access to files. Only grey Screen. Boots up to Browser.

I need help! My iMac either has been attacked by Virus or Worm. I can boot up to a Firefox Browser but that is all. The iMac has no files accessable and the Desktop is just a grey screen. I tried inserting the Mountain Lion Disk but could not access it, and it can not be ejected. No external Disk is accessable.
I don't know what to do?

If you're running Mountain Lion (there isn't normally a separate install/restore disk unless you specifically made one from the downloaded installer file, so not sure what disk you put in the drive) try booting into the Recovery HD, select Disk Utility, click on Macintosh HD and select 'repair disk'. If any changes are made click on repair disk again until you get a clear pass. Restart as normal from the Apple menu.
Restart holding Command=r to boot in the Recovery. More info here:
http://support.apple.com/kb/HT4718
To eject the disk try restarting holding down the mouse button until the disk is ejected. Other possibilities for ejecting a stuck disk here (although you obviously need a working machine to be able to try them):
http://osxdaily.com/2009/08/28/eject-a-stuck-disk-from-your-mac-dvd-super-drive/

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