Ok, I now had Windows Update run and install some outstanding Windows Updates (against the company guidelines as they are supposed to come centrally from the IS department). This obviously resolved the issues. At least I experience no more issues until now.
My win7 Home Premium and Win8pro are 64bit. The Win7 Enterprise I don't know currently, will have to start the laptop later. Submitted a ticket as well. Edit: The Win7 Enterprise is also a 64 bit version.
It happens to me as well now. I just was updated from XP Pro to Win7 Enterprise today and installed Fences 2 and now immediately when I start Fences the Explorer crashes. That is 3 to 4 times in a row and then Fences gets deactivated as it recognizes something is wrong. On my home system with Win7 Home Premium I had it running without any problem as well as on Win8 Pro. So now I went back to the Fences Pro Versions but it keeps doing the same thing. Very annoying and sad, as I got used so muc