Can you please attempt a complete manual uninstall and reinstall.
First of all go to C:\Program Files (x86)\FXpansion\Etch and run the uninstaller. This will delete the majority of data we need it to but not all. Once the uninstaller has run its course you will be told which files are still on your machine, please locate and trash those.
Finally, just check the following locations to ensure that there is no Etch/FXpansion data present:
C:\Program Files (x86)\FXpansion\Etch
(you will need to enable 'hidden folders' in order to access 'app data'. This page explains how to do that http://www.sevenforums.com/tutorials/39 ... -hide.html
Finally, your VST plugin folders (ensure both the 32 bit and 64 bit etch.dll's are gone)
Now please ensure that UAC is disabled on your machine and redownload and install Etch v126.96.36.199
(information on disabling UAC can be found here http://www.howtogeek.com/howto/windows- ... ows-vista/
Let me know how you get on.