Hi, I'm Robinson, and I’m happy to help you today.
I know how frustrating this may be for you but I'll do my very best to help you.
Some users are having problems with the new launcher, downloading and installing the launcher for Windows 7/8 should fix the problem. You can download the launcher for Windows 7/8 at this link.
https://www.minecraft.net/en-us/download
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products).