Hi - Sorry you're having trouble.
1st I presume you have read this - top of main page ..
http://www.simviation.com/accessprob.htmYou don't say whether this has just started. No changes have been made since dividing the site into free & pay about 6 weeks agao with a new FTP server for the free site to control bandwidth losses.
If something has changed since I would guess it is your system at the root. I have thoroughly checked the site using various locations, browsers & ISP's & narrowed problems down to the Opera browser connecting to the FTP (free) site files (which will be resolved shortly I hope) & anyone not connecting directly - for instance using a proxy server to connect. The majority of people have no problems.
(Spyware software can be very paranoid - often identifying harmless cookies, etc as spyware - whereas in fact they are simple utilities to make life easier for users by avoiding the need to log-in, etc. )
Please let me know how you get on & thanks for the feedback.