i have about 40 3rd party softwares, don't most people?
I use very little in the way of third party applications and I am very careful of what I install. The lesson was learned after having problems that ended with having to do an entire system re-install. The problems were caused by a third party piece of software.
There are folks at this site far better qualified than I to comment, but it essentially came down to the fact that some third party software is written with shortcuts that are incompatible with the operating system.
Since that re-install my rule has been: "If it ain't endorsed at FTM, it ain't going into my computer."
ryck