Where are the projects located?
For about the past two weeks we have been copying them down from the server to the local workstation of whomever is working on them.
Are you running any source control? I ask because I found that RoboSource had installed itself & was running as a service on my machine even when I didn't need or use source control. Disabling the services improved my performance.
In addition to Jeff's comments...
Are you copying down by using copy and paste? If so zip on the server and copy the zip file.
In your first post in this thread you say "Also, are there any known issues with Windows 7 64bit and Robohelp?" Please see the Sticky Topic "Before You Post" where it is requested that all threads start with the version of RoboHelp used. Both 8 (patched) and 9 should work fine but there may be problems with earlier versions.
See www.grainge.org for RoboHelp and Authoring tips