Help with Mod Loader

U tried compressing and de-compressing?

What good'll THAT do????????

I GOT A SOLUTION
1)bakcup your saves
2) delte .minecraft
3) force update
there you go

dude i have a solutin back up your saves and delte .minecraft!
and frce update ! there you go

i even deleted bin and runed minecraft to get it back with a clean fresh start. i draged all the files from ModLoader into minecraft.jar. (NOTICE: i did NOT open modloader with IZark because when i had both open with IZark, I dragged it and a stop sign was there that would'nt lemme. so i just used Modloader the folder of it. in order to get the folder, i extracted Modloader.zip.) ( IZark is an archive program that works the same as winrar and 7-zip.) Ok, back on topic. So i dragged the files into minecraft.jar and deleted meta-INF folder. i did NOT derag the files into any of the folders. then i closed minecraft.jar and ran minecraft. no black screen. does that mean i installed modloader right but not fossils and arcealogy?

You are clearly doing it wrong, start again. Click force update and start with a clean copy of minecraft jar. Then drag the files into the jar using winrar, and delete the meta-inf folder.

You cannot get a copy from someone else, distributing the jar is illegal.

what's wrong: When i try it once, no black screen, but cant do the things in the mod.
I try it again, (Using my backup of minecraft.jar) and black screen. i did both the exact same but No. it Did NOT work. is it maby my invisible texture pack or moon texture pack that's conflicting? Do i need the yogbox thing? does Yogcast teach you how? all the other tutorials on planetminecraft, minecraft fornums, and youtube failed.
Also i found out something: in .minecraft (I just type AppData, not %appdata%) there was a text document called modloader. i checked it out and it was some sorta log. it almost said what it said when it crashed:
Aug 19, 2011 9:27:50 AM ModLoader init
FINE: ModLoader Beta 1.7.3 Initializing...
Aug 19, 2011 9:27:50 AM ModLoader readFromClassPath
FINER: Adding mods from C:\Users\Heather\AppData\Roaming\.minecraft\bin\minecraft.jar
Aug 19, 2011 9:27:50 AM ModLoader readFromClassPath
FINER: Zip found.
Aug 19, 2011 9:27:50 AM ModLoader init
FINER: THROW
java.util.zip.ZipException: invalid entry size (expected 1275461640 but got 832 bytes)
at java.util.zip.ZipInputStream.readEnd(Unknown Source)
at java.util.zip.ZipInputStream.read(Unknown Source)
at java.util.zip.ZipInputStream.closeEntry(Unknown Source)
at java.util.zip.ZipInputStream.getNextEntry(Unknown Source)
at ModLoader.readFromClassPath(ModLoader.java:1098)
at ModLoader.init(ModLoader.java:812)
at ModLoader.AddAllRenderers(ModLoader.java:183)
at th.<init>(th.java:60)
at th.<clinit>(th.java:9)
at net.minecraft.client.Minecraft.a(SourceFile:318)
at net.minecraft.client.Minecraft.run(SourceFile:716)
at java.lang.Thread.run(Unknown Source)
what does this mean?

Please specify what is wrong. Is minecraft just going to a black screen after you loaded a mod? Then you haven't deleted META-INF from minecraft.jar (You open it using WinRAR).

If you always Force Update after applying a mod, it will delete the mod from minecraft.jar.

If you can't find .minecraft, then I don't exactly know how to find it on Windows Vista. But on XP, you open the start menu, Run and then typ "%appdata%" and you should find .minecraft folder there, with the bin and then jar.

I DID! I FOLLOW A BUNCH OF TUTORIALS PERFECTLY BUT NOTHING WORKED!!!
(caps)

DELETE THE META-INF FOLDER!

Just the minecraft.jar