NMEATime FAQ   

NMEATime is running in Vista or Windows 7 but the clock does not update. What gives?

Currently NMEATime runs as a normal application in user mode. Newer versions of windows consider setting the PC clock an administrative activity and will not allow applications running in user mode to set the clock.

To allow NMEATime to run and set the PC clock, you must run it in "Administrator" mode. To do this, find the short that starts NMEATime and right click on it. Select the "Properties", click on "Advanced" and check "Run as administrator" checkbox.