I installed Eclipse (Kepler) on this W7 64-bit machine and initially I could run it "normally" by just clicking the desktop icon or whatever. Then I replaced the whole "workspace" directory with one from another machine (because I'm changing systems).
Now if I run Eclipse not "as administrator" it opens and will even run apps... but nothing can be saved, including changes to files and updates to the .metadata of any kind.
I changed all the "ownership" and "permissions" which could possibly be involved. I am the only user of this machine, and I am in the administrators group. I CAN still use it, if I run "as an administrator". But I'm stumped why the UAC should have been happy to run Eclipse before without the "as 'strator" but now refuses...
Because... what I've understood about this question is that the UAC looks at apps and decides whether or not they look dodgy and on that basis decides whether you have to run "as 'strator". So what's changed?
I have the option of uninstalling Eclipse and reinstalling it, and then incrementally adding the various project folders... fine, it may work. But I like to understand these things as far as is feasibly possible!