Minecraft won't work, will open but then freezes up and closes, or it says "Using incremental CMS is deprecated and will likely be removed in a future release"

Ive already tried re-installing minecraft 5 times.. It won't work and i'r getting really frustrated. I haven't been able to play mc in 5 months. Please fix.

1. Won't Open at all says "Please re-install M.C.
2. Says Using incremental CMS is deprecated and will likely be removed in a future release
3. Freezes up and closes
4. just crashes.

Maybe its my computer but i really hope not, i love Mincraft and i hope you can help me fix my problem. Thanks