|"the program crashed and has been refusing to work since"|
Try Safe mode.
If it still will not run.
Please download Rkill from any one of these links and save it to your Desktop. If your default download location is not the Desktop, drag it out of it's location onto the Desktop. Copy & Paste the contents of the log in your reply.
Double click on Rkill to run it. If the first one doesn't work try the next one.
This will help remove certain processes and should restore any file associations and your desktop. Note: Your system is still infected as Rkill does not delete files - it merely helps to temporarily disable the infections, allowing us to start the cleansing process.
Do NOT reboot your machine. Each time you reboot, Rkill is disabled and you would have to run it again in order for it to be effective.
message edited by Johnw