OK, I had the same problem, I had VMware fusion 5. I updated my OS to Yosemite last night and this morning VMWare Fusion puked all over the place and couldn't open. So I went and downloaded Fusion 7 Pro thinking that I will just install that from scratch and everything would work! Wrong...
It kinda sucks but what finally worked for me tonight (in this order) is that I
1. formatted my hard drive and
2.restored a fresh copy of Mac OS (Mountain Lion)
3. I THEN downloaded and installed VMWare Fusion 7 pro.
4. After I installed VMWare 7 Pro THEN
5. I updated to Yosemite. IT worked!
So basically you have to be running or have installed VMware Fusion 7 BEFORE you upgrade to Yosemite and the all the links will port over (or whatever caused it to break in the first place.)
-Luke
