I tried to update my x300 in: http://support.euro.dell.com/support/downloads/download.aspx?c=uk&l=en&s=gen&releaseid=R120775&SystemID=LAT_PNT_P4_X300&os=WW1&osl=en&deviceid=3601&devlib=0&typecnt=1&vercnt=3&formatcnt=1&libid=7&fileid=160873

on this one and the related (R96945 R114081 R120775) I get the following:

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C:\DOCUME~1\user\APPLIC~1\SMBIOSSP.exe
C:\windows\system32\autoexec.nt.
The ssystem file is not suitable for running ms-dos and Microsoft Windows applications. Choose 'close' to terminate the application.
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Please help.

Thanks