Crash when loading new map (after installing new version : 1.7.10 - NB : can't launch 1.8.8)

I was playing Minecraft in the 1.5.2 version and wanted to update my version.

1-I tried to install 1.8.8, but when into trouble.
2- I uninstalled my previous MinecraftSP (1.5.2).
3- I tried again to install 1.8.8, but there was an error while launching, saying it was unable to unzip Natives pack.
4- I uninstalled things on my computer (my sons' advice)
5- It finally launched 1.8.8 version.
6- When I tried to generate a world, it would never end...
7- I decided to create a new profile on the launcher, with a 1.7.10 version.
8- When I try to generate a new world, I have a crash

I can't play anymore, neither my previous saves, neither a new one...

Thanks for your help