Random number generator in Windows 2008 R2 & Win 2012

We plan to put into 1500 VMs' OS scheduler to run daily to make them "activate" back their
agent (could be a backup or Deep Security agent) back to the central server.  Due to unknown
reasons (could be timeout or agent failed to comms back to the server), the software vendor
can't provide a permanent fix or a 'clever' agent that could self-correct itself to re-establish
connection back to the central server (so that central server could manage them)

However, with so many VMs activating back (making Tcp connections) to the central server,
the central server may not be able to take it (ie # Tcp connections max'ed out).

For Linux, I could make the script sleep a random amt of time before activating but for
Windows, is there a random number generator?  I plan to put at the beginning of the
Windows batch script  "ping localhost -n Random_#"  (ie equiv of Linux "sleep Random_amt_time"