Snad ho máš někde v nabídce Start, tak se podívej na cestu.
http://ask.brothersoft.com/what-is-the-path-to-win dows-picture-fax-viewer-78821.html

The following command should force a reinstall of WP&FV...
Go to...Start / Run and type (or copy/paste):
regsvr32 /i shimgvw.dll
(yes, the space after the 2 and the space after the i is required)
Press...Enter...
You should see a dialog box that says:
DllRegisterServer and DllInstall in shimgvw.dll succeeded