No, I'm not storing or collecting any credit card informatio. Just contact information and some information of services what customers have ordered.

Little about my system tho if it helps for helping.
I have dedicated server and I have installed plesk on it.
I have read something about SSL certificates and thinking of buying one?
So, if I buy on of these SSL certifications, could it be so simple that when I receive one, then install it via plesk my pages would be secured?

Anyway, thanks for replying SOCK and about that robots.txt: I use already that file but somehow I have this fealing that it's not stop those crawlers? Or is it that powerfull? ;)

Thanks!