First of all, every one here who "Accidentally" deleted your System Preferences:
Why/how on earth did you do that? There are at least two safeguards that should make you stop and think about what you're doing (authorisation; empty trash).
Second: you should have a backup. What if you "accidentally" delete one of your files, like photos? If you are in the habit of deleting system files, then a backup makes restoring them very easy.
Thirdly: asking for (and accepting) executables from random people on the internet (no offence, justperry!) is unwise at best. Even if the file is actually the correct one for your OS, it could still be laced with malware, either unwittingly, or deliberately. System files should come from a trusted source, such as your own backup or an installer.