Viewing the Error Log with the Enterprise Manager 
Procedure
All the currently available logs are displayed.
The messages in the log are displayed in the right-hand pane. You can display the last six logs in the Error log menu.

A new error log is created each time SQL Server is started. SQL Server retains backups of the previous six error logs. If the log file name is E:\MSSQL7\LOG\ERRORLOG, the last 6 log files are archived under the following names:
E:\MSSQL7\LOG\ERRORLOG.1
E:\MSSQL7\LOG\ERRORLOG.2…
E:\MSSQL7\LOG\ERRORLOG.6
Each time the SQL is started, the archived oldest log files are overwritten and are lost, unless you save them first. If you have a serious problem, you should immediately save these files otherwise they will be lost.