How to find out the IPS and DS Service Pack and patch levels in windows server.

Hi,

I have installed the Information Platform Services 4.0 and Data services 4.0 in windows QA system, now we need to install the same version of IPS & DS  in windows PRD system for this how could we find out the exact version of IPS & DS  ( Service pack and patch levels ) and where we can find the same.

Many Thanks,

Sudheer