Your screenshot did come through. If you have problems attaching to the forum use a file sharing site such as imgur.com
Is it just exporting that is a problem?
Can you open a jpeg image?
What version of Windows are you using?
If you installed over Gimp 2.8 there might be old files remaining. Gimp 2.10.6 now puts all the system plug-ins in separate folders. The file to import/export jpegs is a plug-in.
If you check in C:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins the structure looks like this:
If there are any files not in folders they should not be there.
Another issue is if you are using an old installation of Windows 7 (but not probable)
Is it just exporting that is a problem?
Can you open a jpeg image?
What version of Windows are you using?
If you installed over Gimp 2.8 there might be old files remaining. Gimp 2.10.6 now puts all the system plug-ins in separate folders. The file to import/export jpegs is a plug-in.
If you check in C:\Program Files\GIMP 2\lib\gimp\2.0\plug-ins the structure looks like this:
If there are any files not in folders they should not be there.
Another issue is if you are using an old installation of Windows 7 (but not probable)