This problem can occur if you are not in the Administrator group of the machine hosting the event file, or, if the Remote Registry service is disabled on the host computer. If either of these conditions are true, the event descriptions might not be available, which leaves you with a fairly useless event log.
You can use the mmc.exe command to open a Microsoft Management Console (MMC) console and specify the /auxsource flag to tell Event Viewer to use an alternate source for the descriptions. For the best results, the alternate source should be similar to the computer that generated the event file to ensure the same components are available to provide full event descriptions.
To run the mmc.exe command, open the Run dialog box or go to the command prompt and type:
mmc /a eventvwr.msc /auxsource=<server by IP address, DNS name of NetBIOS name>