For SQL 2005, delete the file:
02.
03.C:\Documents and Settings\\Application Data\Microsoft\Microsoft SQL Server\90\Tools\Shell\mru.dat
04.
05.For SQL 2008, the file location, format and name changed:
06.
07.C:\Documents and Settings\\Application Data\Microsoft\Microsoft SQL Server\100\Tools\Shell\SqlStudio.bin
08.
09.
10.
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Shut down all instances of SSMS
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Delete/Rename the file
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Open SSMS
11.
12.For Windows 7, it's in the following:
13.
14.SQL 2005:
15.C:\Users\\AppData\Roaming\Microsoft\Microsoft SQL Server\90\Tools\Shell\mru.dat
16.
17.SQL 2008:
18.C:\Users\\AppData\Roaming\Microsoft\Microsoft SQL Server\100\Tools\Shell\SqlStudio.bin