I have a Dell dimension 5150. I can no longer access anything except the internet and view files. Everything comes up with the message "Windows cannot access the specified device, path, or file. You may not have the appropriate permissions to access the item." I am the only user of the computer and have Windows XP with SP2. I can't do a system restore either as it won't let me access that either. I don't have a whole lot of computer knowledge when it comes to stuff such as this. If you know what has caused this and what I can do to get back to normal operations it would be greatly appreciated, thank you.