Dtakias - I had the exact same problem at my organization. I have not tried any of the recommended solutions posted above.
However, I may have an alternative solution that worked for me.
I created a logon script for the affected users. The script is one line and simple. It goes like this:
powercfg /setactive "always on"
This way everyone's power settings are consistent and I don't have to worry about the laptops (that are shared) going into standby mode, etc.
Hope this helps in some way - Jeff