I am having problems as some computer from an IP address is trying to access all the files on my server.
How should I change the .htaccess file so that IP address gets NO access at all to any files? And which .htaccess file do I change? It looks like I have one inside each folder.
The basic mod_access module should get you what you need
Something like that. I dont know the exact syntax. Keep in mind that depending on your exact version of Apache (1.3/2.0/2.2) then the module requirements might be different. I think in 2.2 you need the authz_host module, but in 1.3 its mod_access.