I'm having serious issues with setting file permissions on my server. I didn't even know a thing about permissions and 666/777 and all that stuff until today when I started installing some plugins on my blog and had to deal with changes permissions. Like I tried installing WP Super Cache and got a message saying my content folder of WP is writable, saying : You should change the permissions on D:\Hosting\(myinfo) and make it more restrictive. Use your ftp client, or the following command to fix things:chmod 755 D:\Hosting\(myinfo). I tried changing the permissions in both Dreamweaver 8, through my hosting provider, and with FileZilla, as well. Dreamweaver said "setting access properties failed for: (mysite)" and FileZilla was saying "command not understood". I'm not even sure what the permissions are set to as of right now. I assume it's a 777 which I've read is a massive security risk. I know this post is a bit open ended but I really am daft when it comes to this so if someone who is better informed could give me some helpful advice I would really appreciate it. Thanks.
The permissions you are trying to set can be used on linux hosting only. From your paths, I understand you use windows hosting. You should set windows specific permissions, try using your hosting control panel to do that.