Question : Reverting to SQL Server Express

After upgrading my machine to Windows 7 running some updates, everything seemed to be working fine. This morning I was unable to start my development SQL Server because, my 'SQL Server evaluation period has expired.' Normally, this wouldn't be a problem, since I've been using the express editions for everything -- or so I thought. Somehow my working instance was switched from SQL Server Express to SQL Server. I have no idea how this happened, but I need to fix it.

Is there any way to fix this without loosing my data?
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[snippet from the error log]

2009-12-28 13:47:27.89 Server      Logging SQL Server messages in file 'C:\Program Files\Microsoft SQL Server\MSSQL10.SQLEXPRESS\MSSQL\Log\ERRORLOG'.
2009-12-28 13:47:27.89 Server      Error: 17051, Severity: 16, State: 1.
2009-12-28 13:47:27.89 Server      SQL Server evaluation period has expired.
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Answer : Reverting to SQL Server Express

copy the mdf and ldf files to some other directory , unintsll the evaluattion version, install the Express , and attach those files as new database
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