How to Prepare for Cisco CCNP R&S

I’m preparing for CCNP ROUTE. I do understand that I can do the big part of the labs with GNS3. I did a nice Client/Server deployment of GNS3. Client is Win7 and Server is VmwareESXi. It is working fine ; as far I do not need to do a lab using a Software on Windows.

Couple a years a go, for CCNA ; I did be able to connect a PC (Win XP) to the GNS3 topology, by using MSLoopbackAdapter. Actually ; with my Win7 Client, I can not make it work. Things seem to be more complicated in a Client/Server deployment of GNS3.

Could someone explain how is the good and safe way for connecting a PC (Win7) to a GNS3 topology (running Remote on a ESXi server) ?