Well..There isn't a easy way to do that however you can call support and get a copy of Cleanwipe Utility..
However if SEP 11 is failing there must be a reason..
go to %temp%\SEP_INST.log
Search for return value 3..
The error would be 3 to 5 lines above "Return Value 3"
If you are not able to determine the error post 10 lines above return value 3 and we should be able to tell you the reason/solution