personally I dont think it would be too easy to just casually hack into a the server bace i'm talking about... It a little bit like trying to hack into microsoft, and beleive me there is a LOT of people trying to do that. plus hacking into an anti-virus/trojan site... you would have to be pretty stupid, if the site owners found out they would know your IP, the port your using, and be able to de-complie the trojan/virus your using.

no the type of server security i was thinking was:
a linux server set as a dedicated router, probly using squid and maybe pc-cillin's virus wall insatlled, wich is then connected to a switch and then the server computers, these would all have to have some type of fire wall of-coarce something like Nortons, that what i use and it's pretty good... The site it's self would be a VPN of computers connected to the server the network computers will just act as storage, the user has no privledges out of their folder, it is a simple file that contains information that can be read and writen to. none of the stored files will be allwoed to run when the user is offline (which stops ppl leaving logic-bomb virus and sighninging of) no stored files are allowed to be executed while in storege either.

--- Now THAT is security