"extrusion file is bad or corrupted" error when a file is chosen, photoshop then "stops working" and windows shuts it down. I then have to restart to make another attempt. Help!
If that is the actual error message, then part of your preferences are corrupt.
Delete or reset the preferences.
How is that done?
Find them in your preferences folder and delete the relevant psp file:
You can also hold down Ctrl+Alt+Shift while the program starts. Timing is tricker, though, since computers are so fast these days.