I finally figured out the problem. One of the system recovery files is infected so every time I perform a system recovery, my computer infects itself.

There's that, and the fact that my new antivirus had a corrupt file that rendered it useless.

I've updated the antivirus which also fixed the corrupt file, and moved all of the infected files into a quarantine folder. These files can no longer be accessed on there own.

Unfortunately, one of these files is needed for RCT3 to run. Looks like I won't be doing anything with it for a little while.

Are those the .dl files that make it run?

I'm not sure. It hasn't been specified.

Sounds like a virus in your system volume folder. Scanning with a reputable anti virus should be all that you need to do.

I've already scanned and removed the virus. Now that the file is missing I can't play RCT3. All my antivirus told me was the type of virus, and the general area the file was in. I'm going to reinstall after I make sure the viruses have been stopped. The latest system scan didn't detect anything but I think there still is something.