Whenever I try to open minecraft it wont upload the update list and it wont load when I click "Log In". it says "can not connect to minecraft.net not downloaded" i have no idea what to do. PLZ help me! also its a grey screen whenever I open and run minecraft where the updates should be thanks!
Did you install any mods lately? If you have, which ones? If you haven't, force update or delete your .minecraft folder located in %appdata%/roaming.
I think the problem here is with Java, you need to re-download and install the latest Java. www.java.com Click Download. I'm not sure if you need 64bit or 32bit, so you might have to find that out.