" I have lost hours of work to this because Eagle doesn't autosave. "
I thought so too and had recreated quite a few design changes, when Eagle was crashing on me in 6.3 or something, with pretty complex designs. I complained to cadsoft about it. They told me to open the latest autosave file. Where's that? Look at all the .sc# and .br# (I think, need to look) files in the folder you are working in - those are the autosaved files. Rename the latest pair to .sch and .brd and you're back in business, with only a few minutes of effort lost.
Think I'll stick with Win7 Pro for a while more yet 8). Very similar to Win7 Enterprise at work. MrsCrossroads had 8.1 for a while and hated it, says 10 is much better.