Server 2003 preventing software installation

I have a 2003 all patched up, but yesterday while trying to update one of the software, it came up with the message :
Windows cannot open this program because it has been prevented by a software restriction policy

I have not come across this error before and everything else seem to install ok, I have checked and there is no restrictions set, I even changed the restriction policy to 'Apply to all except administrator' but dont seem to make any difference.
What other settings can I look on my server to find out what is blocking it ?
It is not the install software package because the manufacture tested on their side, also trying to install the previous version of this software also now bring up the same errors.
Have tried RUN AS with the DLL blocked unchecked as well as RUN AS admin without luck.

Thanks for any help on this.
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As Software Restriction Policies (SRP) are a Group Policy-based feature you might want to run a gpresult from the "problem" server and from another Windows 2003 server and then compare the group policies applied and other output.

Start a Command Prompt (cmd.exe) with Administrative permissions
gpresult /R /SCOPE COMPUTER /V

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CombemartinAuthor Commented:
Turn out to be a Windows update that changed the restriction policy, thank you for your help.
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Windows Server 2003

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