Not sure where you got that 4% figure from. This chart from 12/2014 shows Win 8 with almost a 14% marketshare:
OS market shareAll forms of Mac OS X combined have just over 5% market share and Linux has just over 1%. Are they terrible OSes as well? Both of them have been around much longer than 16 months. Also don't know where you got that 16 month figure since Win 8 was released in Oct 2012 so it's been on the market for 28 months.
I don't believe that Win 8 is the best OS of all time nor is it without its faults but it is a perfectly usable OS that doesn't deserve the bad reputation it has. I can't tell you how many people I have encountered that determined Win 8 was bad just based on hearsay and have never actually tried the OS.
IMO, the reason why some people have so much trouble with Win 8 is because they never bothered to learn how to use Windows, they only learned how to use the Start Menu in Windows. When MS took that away, they were lost even though the Start Menu is redundant, unnecessary and antiquated. That's why most users are fine with Win 8 if you install Classic Shell for them.
My 2 sons and my sister are 3 people that I know personally that recently started using Win 8 and none of them are having issues with it. My sister is one that relies on the Start Menu so she has Classic Shell on her computer. Neither of my sons uses Classic Shell.
That doesn't change the fact that your suggestion of switching from Win 8 to Win 7 to solve the OP's problem was totally inappropriate. Would it fix his problem? Maybe. But then re-installing Win 8 might fix it as well. The point is, the problem doesn't stem from what OS he is using and it's not necessary for him to switch to a different OS to solve his problem..