Today I downloaded the 35S emulator, rev. 19048 from
http://www.hp.com/sbso/product/calculators-emulators/scientific-calculator-emulator.html
and installed it on Windows 7
It would make an excellent replacement for the Windows calculator, only I can't see how to copy/paste numbers from/into other Windows applications.
I think copy/paste would be an interesting feature for future emulator versions.
cheers
Ivan