SMP 3.0: Not able to upgrade to SMP 3.0 SP03 PL01 runtime from SMP 3.0 SP03

Hi Experts,

I am trying to upgrade SMP 3.0 SP 03 to SMP3.0 SP 03 PL01 patch. But when i launch the installer it says:

Installer could not check for administrator privileges.

You must have administrator privileges to install SAP Mobile Platform 3.0 SP03 PL1

I am not able to proceed ahead. What could be the reason for this pop-up?

Regards,

JK

P.S.: There is only one admin user on this machine and with the same user I have installed SMP 3.0 SP03 and mobile SDK already.

P.S.S.: I have tried the same after logging with .\smpServiceUser user also but same warning.