It installs fine but when I try to run it I get a pop up that says it can’t create “library/metadata/00” it also suggests that I might be out of disk space.
I have tens of gigs minimum available on all my drives!
I tried installing on F: drive where I usually install everything and also on C: drive wich is my OS only drive… No luck! 
Edit: It then shuts itself down to desktop…
Any one has a clue?
My machine:
Windows 7 64 bits
AMD Phenom II X4 965 Black 3.40Ghz
4gigs DDR3 10666Mhz Ram
Thanks!
simple 
you are trying to open a project that is read-only, probably under a subversion program… unity try to write something while he cant
best trick would be to cerate a new project and overright the folders by the one you are using or removing the read-only from the project you try to open
cheers
First time around that might have been the case but 2 installs later on different drives and simply Double Clicking Unity.exe and it’s still doing the same thing…
alt+click let you wheter selec another project or create new
cheers