It sounds like your native files may be corrupt so my knee-jerk response would be to wipe your bin folder (located in %appdata%\.minecraft) which is where your native files are. The launcher will re-download the whole bin folder and you will have shiny new native files.

Before doing this I'd suggest making a copy of that bin folder somewhere before you wipe it, and if you have mods they will need reinstalling.

Launching Game
Looking for old natives and assets to clean up....
Unpacking natives to
Couldn't unpack natives!
java.util.ZipException: error in opining zip file

._. it happened again :c. did I do something wrong? I made a copy and put it with the other computer files. deleted the other 1 and redownloaded but this came up still

I might mess up. I usally do by steps or do something by accident. sorry >.> i'm not the best person for this stuff.

Its fine Myrf. I got that. but it does the same. I restarted my desktop as new and I just downloaded Java and downloaded Minecraft. I got errors from Java after that. Thx guys. Ur guys are great

Have you tried uninstalling and redownloading? That seems like a common solution that doesn't always work but something willing to try.

There's a tool here that will detect and remove old versions of Java -> http://www.java.com/en/download/faq/remove_olderversions.xml

Although I seem to remember the newest version having a 'check for and remove old versions' utility bundled in as part of the installer. 

wait. Do I have to download that entagled? I got the same thing. I kept the natives files. deleted the whole folder out of the Bin. Downloaded Java 7 Update 51 (ithink) and I get this natives thing still ? what did I do wrong?

Oh wow.  I google'd minecraft couldn't unpack natives and apparently that's been a not-too-uncommon error that's difficult to pinpoint.  There's been a host of suggestions on how to resolve it, ranging from completely disabling security software / antivirus, running the launcher as administrator, running malware scanners and hijackthis, moving the launcher to a different folder and clearing the versions folder, verifying that you have the newest installer / launcher, and more.  But, I'd hardly say that there's a conclusive answer as to what had caused the problem or how best to approach fixing it, as different things have worked for some and not for others.  I'd recommend reading through some of those topics (minecraftforum had a few at the top of the search results) and going through the various things that have worked for others.  2-1/2 days to go, good luck!

ok but if my comp acts up xD I think i'll spend the Nbz V6 at home xD

o.o soo ur saying just go to the app data thing and delete all that's there? ?

Nooooooo!  Just the .minecraft subfolder within %appdata%  (I don't think it's been mentioned, but I'm assuming you're running a Windows OS, or the folder locations and file names that I give will be different)

You don't even need to delete it, as that folder contains your world files, screenshots, and other information that you may wish to keep in the event that you solve the problem with the launcher error.  The best course is simply to rename it, which will force the launcher to create a new .minecraft folder, pull a new copy of program files from the Mojang server, and give you a clean slate in that regard.  What you rename your existing .minecraft folder as is up to you, .minecraft.old, .oldminecraft, so long as you can find it again if need be.

I think you indicated that you'd already deleted or renamed your .minecraft folder in %appdata% (which would be in {drive}\Documents and Settings\{user}\Application Data\.minecraft), or at least deleted the /Versions subfolder, but I may have misunderstood.  In that case, the launcher should have tried to pull down a new copy of the latest version and populate a new .minecraft folder, which may be giving the same error when trying to launch, leaving me to suspect a problem with either 1) folder permission problems while trying to create or modify something within that directory path, 2) connection issue going out on the network from a firewall, anti-virus/malware, or local malware, or 3) a problem with your local copy of the launcher.

Starting with our .minecraft folder renamed to something that the launcher won't know to look for, I'd say we might as well rule out the possibility of a launcher problem.  At this time I would go ahead and delete the launcher, head to minecraft.net/download and pull a new copy of the minecraft.exe launcher, and save it to either the desktop, downloads folder, or 'My Documents'.  I don't know that it would make any difference, but as someone had suggested on another post, perhaps try saving the launcher to a different location than where it had been previously.  Run the launcher, and depending on your version of Windows and your security settings, you will likely get a prompt upon first running the launcher asking if you want to allow minecraft.exe to make changes to your computer, which of course we must say yes.  It should then attempt to download and unpack a new copy of 1.7.4 into a new %appdata%/.minecraft folder, and then launch that %appdata%/.minecraft/versions/1.7.4/1.7.4.jar with your installed java (I think that path is correct?  You can change all this within the launcher profile settings, but I believe that to be the default setting)  If it fails at either of these points, we have to look at other possibilities. 

i dont have a bin in my .minecraft
i dont know why but my minecraft works perfectly without a bin folder

I use Mcafee Total Protection 2014. I did the same before I even redownloaded my Antivirus when I restarted my comp as new