Frozen at flash screen

PT3 gave me an error about being unable to access a tmp hand history file (FTP) due to it being used by another program and closed. The program will not restart. Nag screen passes ok, then the program stays stuck on the flash screen. I've tried restarting pc to no avail.
[Don't really want to install again and have to start a new DB... again...]
[Don't really want to install again and have to start a new DB... again...]