Patch determination without scanning real machines

Hi, Is there a way to get the missing pathes for a set of software without installing them on real machines?

Eg:

I have PCs with different versions of Windows OS, MS Office and other Microsoft products. I need to have as many physical (Virtual) machines as the number of versions of the software to get the actual missing patches.

Instead of having physical machines, if vCenter can take a file which has all the information about installed software and gives me a list of missing patches on all machines will help me to reduce the dependency on real machines.

Is it possible with vCenter / Shavlik protect?

I am using vCenter protect 8.0

Thanks

Sriknath Badireddy