LSA Shell error after doing Avast scan

I am getting the following error when starting Windows XP. It began after I did an Avast scan for viruses. Most people that receive this error also have Windows shut down. I do not get this. Below are details for the error.

LSA Shell (Export Version)encountered aproblem and needs to close.

Error Signature
szAppName : lsass.exe szAppVer : 5.1.2600.2180 szModName : lsasrv.dll
szModVer : 5.1.2600.3249 offset : 000755d5

The following files will be included in this report to Mircrosoft

C:\DOCUME~1\Kevin\LOCALS~1\Temp\WER1ab9.dir00\lsass.exe.mdmp
C:\DOCUME~1\Kevin\LOCALS~1\Temp\WER1ab9.dir00\appcompat.txt

Maybe you could follow Vlk’s instructions here http://forum.avast.com/index.php?topic=33616.msg281371#msg281371 to make a dump of lsass.exe.