Uninstall both the Catalyst and DisplayLink drivers. Once they're uninstalled, manually go into the Program Files (x86 and x64) to make sure all ATI and DisplayLink folders are deleted. Go into your user profile's folder (in 7 Ultimate x64 it's in C:\Users\YOURUSERNAME\AppData) and delete any ATI and DisplayLink folder(s) you see in the Local, LocalLow, and Roaming folders.
After all that, reboot and install Catalyst first, reboot then install DisplayLink.
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