You got bant from a .dll file. Which means you or someone using your account was cheating/hacking. VAC doesn't ban for skins or any texture replacement files (VTFs).
Asking for a crack doesn't do any good for your honesty neither. Makes me think you dl'ed some cheats...Also the fact that this is your second account.
I don't believe a keylogger stole your account info, but I've heard worse. Like my sister installed hacks on my comp when I wasn't looking...
As far as that problem goes, you probably know as well as I do, its a perma ban - will never be lifted..
If you genuinely did get the account stolen you can submit a steam user ticket, but good luck on that one, unless you can prove your claim.