I'm sorry about the issue. Please right-click on Start, then Control Panel, then open Programs, then open Default programs, then open Set default programs, then if you see the Olympus Master there, then click on it, then set it as default.
If that does not work, please open a folder that contains pictures, then right-click on a picture file, then click on Properties, then click on Change, then select the Olympus Master program, then click OK, OK and check.
Please reply at the box below to continue troubleshooting. Thank you.