[STEAM MW2]Files different from server

I had custom camos working fine two weeks ago, but then I left that house to go on vacation. When I returned, nothing had changed, yet whenever I tried to join a public game it will say 'files different from server'.

Here's what confuses me:
When I start a private match, they all work GREAT. Then public time comes, and I have to verify the files to play. It's always only one or two files that can't be verified, never more.

I talked to derpderp, he said to try Pakscape and installing, that didn't work. He said something about VAC3, but I didn't really understand it. My knowledge extends to installing things and that's about it.

If anyone has any ideas, please post here.

Notes: Yes, I can still play mw2. No, I cannot play mw2 with custom camos.
I know this is a repost of a thread under 'Texture Modding,' but I realized it was in the wrong section and figured I would get more responses here.

Thanks,
`Itz

There's a sticky in the texture mod section that solved this

It doesnt have anything to do with that atm, as he was having issues with even mods that I had released. Unless you are modifying them after you download them, its VAC3.