Local Security Handling for SAP Installation Server

We are looking at installing SAP gui for windows 7.20 using the installation server. While trying to configure the local security handling I am getting the message on the final step

"failed to configure local security handling (LSH) could not store IS user data"

I have only found one log file called ServerRecord.xml, the entry does not give any more infomation

<ActivityName>LSH Configuration</ActivityName>

<ActivityDescription>Administrator attempted to configure Local Security Handling</ActivityDescription>

<DateTime>13/05/2010 12:16</DateTime>

<ActivityStatus>Failure</ActivityStatus>

<ErrorDescription>Could not store IS user data.</ErrorDescription>

</Activity>

<Activity>

Can anyone tell me where I may find some more infomation/documentation on the problem.

Thanks