At shutdown I sometimes get "DDE Server Window Explorer.exe - program error; The memory could not be read". I upgraded from an old Win7 install yesterday which has had no similar errors ever and is very "clean" (several installed programs but not cluttered, it is essentially a backup I made before I started to actually use the PC). And I also find it strange that I get memory access error while trying to shut down (via the virtual button in the bottom right corner), I mean, if I was trying to start an application and then got such an error I would suspect that application, but during shutdown, nothing is being started, it is being.. shut down.

And when I try to start the PC iy doesn't start immediately, does some error searching first

2 days ago I tried the same upgrade from Win7 and couldn't dind the shutdown button (!) in windows so I pressed the PC's button (hoping it would shut down, although it was set to power save mode in Win7) and then got "PAGE_FAULT_IN_NONEPAGED_AREA", which lead to autorepair forever, I couldn't get it to work. At that time I had kept all programs in win7, including Comodo Firewall which doesn't support Win8 in that version and caused a couple of popups when I started Windows but I thought it simply didn't start. anyway, I uninstalled Comodo and some other stuff before making a new attempt at upgrading Win7 to Win8 and it seems to work better now but not good.

Possibly similar issues:
windows 8 having restart problem...... - Microsoft Answers
Application Error: the instruction at 0x72f46954 referenced memory error
Windows 8 ERROR #132 when I start HB

Another peculiar thing is that one of the appliccations that is supposed to starta at windows start (listed in autostart tab of tast mgr) does not get started. Strange. I can start it manually once Windows is up, no problem.

BTW, does Win8 previes releases come regularly or is there only one? I mean in case this means win8 won't work with my installation, might I just as well give up and stick to win7 then or is there any reason to think this error will go away?