Hello everyone, I might sound like an idiot to you, but I've searched/read info about the difference between 32 and 64 bit OS-s and haven't really understood it. The only thing I've understood is that you can use more than 4GB RAM on 64bit. I will not ask you to enlight me their differences but I want to ask if there is any reason NOT to install Windows 7 Ultimate 64bit on my PC. Also, I would like to have the dll files I need to replace so I can install custom/unsigned themes (uxtheme.dll, etc.), and please don't send me the uxtheme patcher, I prefer to do it manually.