Are there many things incompatible with Win8 that work with Win7? You guys tempt me with the performance improvement over Win7.
In broad, Mubs, the answer is "no". Most things that run on Win 7 will run on Win 8. Doubtless Merc will give you a more comprehensive answer.
I did strike a weird one the other day. I installed SMPlayer as per usual (I like to have a couple of different media players on a machine, and SMPlayer is my usual next-choice after VLC) and it worked fine. The next time I used the machine (a few days later) it failed to start. After a lot of messing about and troubleshooting, I was left with no alternative other than a full reinstall. I can't really see how merely installing SMPlayer could cause the system to fail to start. So far as I know, there is no load-on-startup component, and it's a pretty benign bit of software in any case. So, most likely, the problem is completely unrelated and SMPlayer was blameless. But te really weird thing is that ... well, I'll come to that shortly.
Eventually, I installed from scratch on a different physical drive and I suspect that the root of the problem might be the original boot drive itself ( a 2TB Seagate). Either that or some strange form of data corruption on a good drive. Plugging the Seagate into the Win 8 box as a slave, it could not recognise it at all, then it reckoned it wasn't formatted, then (after more tries) it wanted to perform a great long chkdsk on it. Meanwhile
at every time through this process, I could plug it into my Win XP Thinkpad (via a USB dock) and see it working perfectly. Eventually, I used the Thinkpad to copy the wanted files onto a third drive and transferred them from that third drive back onto the Win 8 box. I haven't had time yet to do proper tests on the now no-longer-required Seagate drive to find out if it's a hardware issue (starting to seem unlikely) or some weird thing to do with Win 8's HDD access.
But now, as promised, the really interesting thing. When I went to reinstall SMPlayer, using the same file I had used the previous time, Win 8 refused to install it, saying it would not run on this version of Windows! Exact same file, exact same Win 8 Pro 64. I downloaded a fresh copy, same deal. Flat refusal to install, where on the previous install it not only went on fine, it ran perfectly too. Go figure.
Meanwhile, I discovered a 64-bit beta version of SMPlayer hidden away somewhere on their site and than installed no problem. But if Win 8 64 doesn't like SMPlayer (standard 32-bit version) why did it install and run just fine the first time?
One more thing, in case no-one has mentioned it: the stupid Win 7 upgrade media clean install bug still exists, completely un-fixed from some years back. You know the one - you clean install as usual and when it is complete, Windows says your (100% legit) product key is invalid. All threse years and STILL not fixed! What is wrong with these people? Anyway, the workaround is still the same - details here
http://winsupersite.com/article/windows-7/clean-install-windows-7-with-upgrade-media-128512