If you're having trouble running Unvanquished due to "VM: Could not create child process: The system cannot find the file specified", please put one of the following files in the same directory as daemon.exe:
http://dl.unvanquished.net/hotfix/irt_core-x86.nexe if you have 32bit Windows
http://dl.unvanquished.net/hotfix/irt_core-x86_64.nexe if you have 64bit Windows