SharePoint WSS 3.0 sites missing.

I have some users who are complaining that the sites have gone missing. I see the errors shown in error log are as below. Please let me know if this could be the reason of sites missing.
Is there a way to get back these sites?


2011-01-10 08:08:38.47 spid18s     Error: 3313, Severity: 21, State: 2.

2011-01-10 08:08:38.47 spid18s     During redoing of a logged operation in database 'WSS_Content_de197ff40ced42dd8e3cb0fd51815d14', an error occurred at log record ID (4916:16:211). Typically, the specific failure is previously logged as an error in the Windows Event Log service. Restore the database from a full backup, or repair the database.

2011-01-10 08:08:38.82 spid19s     74 transactions rolled forward in database 'WSS_Content' (10). This is an informational message only. No user action is required.