When I install and start up Quest on my computer, Windows 7 64-bit OS, it refuses to run. The icon for Quest pops up on my taskbar as if it is currently running, but no window shows anywhere on my screen. I have uninstalled Quest and reinstalled it. I have installed and uninstalled previous versions of Quest to see if an earlier version may work. Same issue.

I know I have installed and used this program on this computer in the past, so I'm at a loss as to what could be causing this.

Well, this was an odd one.

Solution: In task manager, right click on the Quest process and click maximize. Then grab the edge of the window to manually downsize it.

Basically I think it was shrunk down to the point that it didn't have a size. That second step I added to manually downsize it was because pressing the button between "minimize" and "close" that usually turns it into a floating window caused it to disappear again instead.