If you run ACT and Quotewerks together, you may see a situation where Act cannot find the attachment folder or Quotewerks will load very slowly stalling at the Setting DTF path. You may also see the message "Act may have been started and closed."
The reason for this is a wrong version of a DLL. Go to the ACT Folder under Program Files and find the file named DartSock.dll. Either delete this or rename it to DartSock.old, rerun Nsetup from the Applications\Quotewerks folder and it should now work fine. Note you may have to reboot.