Spoolin, Per the WDM 5.5 Install guide, verify that you are using Windows 7 Enterprise. Also note that WDM 5.5 is no longer supported, so I would also recommend that you install version 5.7.2 instead. 
Just tried to install WDM 5.5 on fresh Win7x64 installation.  When launching WDM, I get two error notices in the Service Logs: Source: GUI;  Description:  unable to find standard service at server 0.0.0.0 and port 8008. Source: Testing Connections; Description: Failed to connect to WDM (DHCP) In the Component Details Report, all components are set to the WDM server IP, except for Standard Services which is showing 0.0.0.0 In addition, HServer is not starting automatically, though it's set that way.  I have to manually start it. I've done this twice, reverting to the fresh Win7 installation for the second try.  First I simply ran the WDM 5.5 installer, the second time I configured IIS according to the details provided in the WDM 4.9.1 Install Guide.  Same outcome. Any thoughts on what went wrong?  
Failed WDM 5.5 installation: unable to find standard server at 0.0.0.0