I managed to find a solution to the Sid problem unbelievably in a macro called @SID - how ironic. However, I now need to write into the script that the logged on user must write their SID number to a file and then the scheduled task must read the sid number from the file and execute the script accordingly using the correct SID. Unfortunately if I use the @SID variable in the policy script it returns the SID of the scheduled task user and not the logged on user.