The %1 Log is full. If this is the first time you have seen this message, take the following steps: 1. Click Start, click ...

The %1 Log is full.  If this is the first time you have seen this message, take the following steps:
 1. Click Start, click Run, type "eventvwr", and then click OK.
 2. Click %1, click the Action menu, click Clear All Events, and then click No. 
 If this dialog reappears, contact your helpdesk or system administrator.