IDE freezes... RegCap.exe locks up Visual Studio

I've been working on this project for awhile and is mostly done. I've been able to build it and test it up until today. When I try to build it, it will freeze (the build animation in the status bar will even stop) and, needless to say, the build isn't successful. VS would freeze until I closed it, not allowing me to do anything with the UI. When I'd close VS, I'd get that "This program is not responding... end now" window and I'd click end now and I'd have to start Visual Studio back up again.

Through a bit of research using a program called Process Explorer, I found that devenv.exe (Visual Studio) began a process called regcap.exe (through more research, I've learned that the name is short for Registry Capture). I've found that if I close regcap.exe (which doesn't appear until I begin a build), then the build will continue as normal and produce all the files. I haven't tested to see if the files are ok or not, but I shouldn't have to cancel the regcap.exe process in order to build. It's never done this before today.

VS only seems to have this problem when I build the Setup project for the Add-in, I can build any other project, alter code, change settings in the setup, anything... I just can't build the setup project without it locking up.

Any ideas of what I can do or change?