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MapSource doesn't run on your PC

1. Uninstall your MapSource program.

2. Go to Start>Run..., in the Open: field, type regedit and select OK

3. Click on the + sign next to HKEY_LOCAL_MACHINE to expand it

4. Click on the + sign next to SOFTWARE to expand it

5. Select the Garmin folder and delete it then exit from regedit

6. Re-install MapSource and update it to the latest version on Garmin's website.

7. Install your maps one at a time and run MapSource after each map installation to isolate which map is causing the problem.