I don't use voiceattack so I can't help you there.
As far as transferring ED to the new PC, if you're on Steam, back up the following folder to an external drive:
C:\Program Files (x86)\Steam\steamapps\COMMON\*.*
Once the new PC is set up, download and install Steam. Once established, open it but then close it, i.e., say "hello" to establish yourself. Don't let it notice you have games you own but "I see they're not there - here: let me download gigs of stuff to you." Shut Steam completely off.
Copy your backed up "common" folder to the correct location. Fire up Steam again. Click "play" on each and every game. There WILL be a few files to download again but instead of taking hours, it'll just be a minute or two. Once they're all back together, go play. Enjoy.