Error when I try to save text

I get an error when I try to change the terms of service or the shipping text or any of that. I tried using the text edit AND the HTML editor.

Exactly what files need to be CHMOD 777, I know my webhost is growing tired of my requests for assistance. (It would be nice if they'd trust me to do that stuff myself LOL)

Warning: fopen(C:/Domains/mydomain.com/wwwroot/shop/includes/languages/english/html_includes/define_checkout_success.php): failed to open stream: Permission denied in C:\Domains\mydomain.com\wwwroot\shop\admin\define_pages_editor.php on line 75
 
Warning: fwrite(): supplied argument is not a valid stream resource in C:\Domains\mydomain.com\wwwroot\shop\admin\define_pages_editor.php on line 77
 
Warning: fclose(): supplied argument is not a valid stream resource in C:\Domains\mydomain.com\wwwroot\shop\admin\define_pages_editor.php on line 78
 
Warning: Cannot modify header information - headers already sent by (output started at C:\Domains\mydomain.com\wwwroot\shop\admin\define_pages_editor.php:75) in C:\Domains\mydomain.com\wwwroot\shop\admin\includes\functions\general.php on line 34

Any help you all could offer would be appreciated :)

This FAQ entry should help. Look in particular at the 4th entry in the list.

Thanks for pointing me to the solution too, appreciate it!
BTW, Is it just best to run the entire app in cgi-bin? Ir does it really matter?

Not an area in which I'm expert, but there's information in the FAQ on this too.