offun.exe is probably malware or viruses. It's possible that your computer's security is being compromised by this program. You must scan your computer right away to avoid any further damage.

offun has been linked to the malware Adware.W32.PacerD, and should be cleaned immediately. Before making any changes to your computer, you should backup your files, or create a Windows system restore point, so you don't lose any essential data.

To be sure that you are not removing non-harmful files, use Computer Associates' free scan of your computer.

Since offun.exe is running on your computer, there is a good chance that more virus is lurking. Get a free scan of your computer by clicking this link.