I am amazed how many have not reinstalled in the last 4 months.
I have had Windows 7 slow down on me every 3 months and then start being unable to run programs. I just accept the re-installs as the cost of running Windows 7. But I do try out every game that comes along. I just wish Windows would not trash itself trying to control every aspect of every piece of hardware and software. I should be able to install and uninstall with no ill effects IMO.
At work we run QNX which has a reliability history as well, but its problem history spans years. No problems last year at all. Original install was in 1998. There are about 20 entries, mostly driver
issues. Such is the life of a stable OS that costs over 10 times what Windows 7 costs.