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I need to enforce a very strong anti bot registration system. my forum does not protect against most bots and we are getting a lot of spam. i want the best available security measures installed

I have 4 websites which need some security, to be able to stop idiots adding data into the registration fields. Had one freelancer who added CAPTCHA but it has not worked. Have a look at my sites first to make sure you can secure the sites please before bidding. aircabs.co.uk, airportcars.info, local-cabs.com, local-cabs.co.uk
Thanks

I have an EA for forex been created by a programmer but looking now to add security on it, so if decide to sell it it will creat a a few digit numbers autoatically as indicator to thier subscription and will be uniqe for that indivitual

Hi i run adult tube site and i have been getting allot of other websites using movies from my site to play on their sites using my bandwidth…..I have some rules in place and security measures set up that seem to stop their uses playing my movies if they are using internet explorer – but if they are using firefox or google chrome the rules don’t work…..and the offending sites are able to play my movies thru their sites using my bandwidth…….I have seen that other tube sites have been able to stop this with all browers .so i was hoping that someone would know how to do this….I have had a couple of programmers have a go at this but were not successful…..if you need more info contact me first before you bid so i can show you examples of what i am talking aboutand give you better understanding of the job…….thanks

Need site to have security. Need an expert fast

fix upload and size of files.exe etc.,
create an option inside admin control with file upload limit for image 1mb, .5mb, 2 mb etc.,

-sql injections forms to be secure use filter or other methods to stop command attacks
-dos vulnerable
-xml coding injection to be secure, etc.,
-mask codes not to allow view source
-find the loophole in which the bot operate inside the site
-credentials, authorization secure
-cross site scripting
-fix or secure all pages define by google hacking

You must know all of the above what they are if you should bid.
You will comment on all of it and your degree of expertise.
I test your ability to secure a site.