How to disable automatic suspend

I constantly switch back and forth between Mac and Win OS and after a few minutes of not using it, the VM goes automatically into suspend mode.

Is there any way to either disable or modify this paramenter?

Thanks,

Sergio

 

assuming you are on windows 7 go to control panel->energy options and select energy plan other than "Parallels plan"

 

Thanks. I am on XP, but I think this should work.