I too, run X7 with no problems. Well, except the ones I cause myself. A lot of problems lately point to a particular Microsoft update. I think that's getting worked out too. I don't run any of the cleaners but I do have a batch file that will dump all temp files. I also use a macro that deletes the clipboard whenever closing documents. I have another batch file I use whenever Corel gets squirrelly. It does a kill task then dumps temp files then restarts Corel all with one click.
I would also delete your log files and your shadow copies as well (if not needed). That can be up to gigs of storage taken if you have never deleted them. MS does have a nice little utility to handle all that stuff as well.
Updates are a double edge sword. They inherently bring instability into the equation. With Windows computers, that's understandable due to all the variables with software and hardware. However, if Mac has their hiccups every now and again with updates and I have far less sympathy for them since they have a lock down on hardware as well, it isn't all that surprising that MS would have their issues as well, especially more so.
However, there is a significant difference between being updated and patched and being bleeding edge. I think with some things, people tend to be more bleeding edge, they may not even realize that, and that is different then being updated and stable.
While my VMs are isolated, I'm running OSs and programs (within the VMs) that haven't received any of their updates at all and they run smooth as silk. Now, my host OS is updated regularly (update Sunday I believe that it is for Linux rigs) and I do run protection software on that before it gets to any VMs, so don't think I don't keep updated. They are a double edge sword, especially with MS and their update history.