I have just installed Dynamips and GNS3 on a Windows 7 (64bit) PC and I cannot drag a router to the topology - I get a message saying it can't create the hypervisor - asking me to check the settings and commenting on a writable working directory.

As far as I can see everything should be OK - I can run dynamips with the IOS image I gave, the tests for dynamips and Qemu under GNS3 both work. I have been through all the directories, and none are RO. Where should I look?

Thanks,
Paul.