In some cases, it is necessary to uninstall and reinstall Logger Pro in order to resolve an issue. This will often resolve device driver and other configuration issues.

You will need to be logged in as an administrator.

To uninstall Logger Pro 3 for Windows 7/Vista:
1. Choose Uninstall a Program or Programs and Features
2. Find Logger Pro 3 in the list
3. Choose Uninstall

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To uninstall Logger Pro 3 for Windows XP:
1. Choose Add or Remove Programs from the Control Panel
2. Click on Logger Pro 3
3. Click the Remove button

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Next, install Logger Pro 3 from an installer of the most recent version. Contact Vernier tech support for details.
http://www.vernier.com/products/software/lp/

Also note that Logger Pro 3 must be installed locally, and not over a network. This is the only way for Logger Pro 3 to have access to the needed drivers.
See: Can I install Logger Pro 3 to run from a server or network location?