Some people were/are having problems with installing Windows 10.
I found a few ways how to fix this.

1. (easiest) Click this link Windows 10 and download the installer with the right bit version ( don't mind about the rest that stands on the side). Don't know where to find your bit version? Goto Start - right click Computer - Press properties - Look for 32 or 64 bit - download on the microsoft install tool side and run it. The rest is Self-explanatory.

2. Not seeing the reservation icon on your taskbar? Press start - search for Windows update - run the latest important and optional updates.

3. Still not working? Goto your C: HDD - open windows folder - open SoftwareDistribution folder - open download and delete everything in there. Next step: press windows key + r - run cmd - type in wuauclt.exe/updatenow

I hope one of these ways helped you