most commonly this is caused by you not using the USA English version of the PE source - the EETech theme files are set to locale 0409, anything else won't work.
Lots of conversations here about it if you search.
OK, but I'm in Windows 7 Enterprise 64bit en-us...
There is an incompatibility with this version ?
Your sure you have all the files in the right folders? If you just have the eetech exe I can imagine this happening.
The same problem.
Windows 8, EEtech from 7.0.1 (patch1) version of EEPC.
I try to load previous version of EEtech (from EEPC 7.0.0) - the interface works fine!
Maybe the problem with the new version (7.0.1) ?
I recreated the image WinPE4 with scratch. EETech graphic works.
Can you run a compare between the two images - that will tell you what the mistake was the first time. Perhaps you had a typo in one of the paths?