This werid thing happened to my Minecraft luancher?

So i was installing a mod, it was actually a mod installer called the hens 101x-ray mod installer. The video--> installed and then went to check it out on my minecraft. I opened the launcher and all that stuff. But then something weird happened, the installer wasn't 1.7.9 like it should have been.It was 1.4.4 and i was logged out. I know you can change versions but i didn't do anything. I checked my minecraft folder and everything was all right, My saves, resource packs and all.Along with all the files.So i wen't back to the Mod installer and un-installed the mod and checked my minecraft and still it was 1.4.4;and i was still logged out. I Decided to re install the 1.7.9 launcher from the minecraft website but the same thing happened. I know MY mojang username and password. But i'm afraid that if i log in something weird will happen. Will i loose stuff in my world? Will it update and can i change back to 1.7.9? Thanks!

Added (1). oh yeah and the installer was 1.7.9 and up to date, so i don't know why my launcher turned in to 1.4.4

This normally happens when installing a mod. Nothing was altered in your saves, your resource packs, or anything of that matter. All that you need to do is to click play when the launcher opens (if it does not, then enter your username and password). Click the big play button and you are all set!