Hi Sam
Is your user id equivalent to root on UNIX system? at same time in windows OS you have to create the same user id with administrator privileges (in both system user id and password should be same).
for example if you are using user id SAPINST equivalent to root access in Unix system, same user id and password you have to create in windows OS local user id with administrator privileges
Kindly check and tell us
Regards
Sriram
