You are used to Windows...
Windows sucks at security, one big reason of why.
YOU ARE RUNNING ALL THE TIME ON AN ADMIN ACCOUNT !
Linux you do not need to be ADMIN 24/7 that is why is more secure.
You are treating Linux like Windows.
Sorry for been blunt, but here is a nice thing to know.
You have a Home directory and that is your world, do whatever you wish there.
The ROOT's world is before that one, so all the files to make your system runs good, is locked away from editing.
Now you say... I am such a PC GOD that I will not screw up the machine. Wrong again. No self respected admin runs a PC with admin right. That is to prevent malicious codes from executing the system.
Pretty neat!
Now, is time for maintenance. You want to install a file. What you do? Google it download and execute it.... Wrong AGAIN !
In K-Ubuntu uses Apt-Get (Debian packets). All you do go to the repository and download it.
Well, Mandriva has some called RPM (Red Hat-Package-Manager) close to Debian's Apt-Get. But is called URPMI. All you do is go shopping at the Mandriva Control Center (kind of Control Panel on Windows, but with the twist that you search and choose what you want to install), the cool thing is.... You do not need to go surfing for RPMs, all is done for you at the click of a mouse.
Mandriva has some called the PLF (Penguin Liberation Front) that has CODECs to view files like sound and video and applications for DVD Backups, like K9Copy.
So, what are you trying to edit anyway? Linux does not have a Register like MS does, that is BAD Yu-Yu and bad programing.
If you want the Admin rights to change config files and such... run them under root (windows is the Run As command, sorry MS, UNIX and Linux where 1st on that idea).
Try this trick on MS....
Search for the IE.exe right click and choose Run As, pick the Admin account, give password and off you go. Type on the URL C:/ and hit enter. Now you are viewing your C:/ as Admin. Go to tools and choose the View Control Panel on the Computer Browser. Now you can open the Control Panel as Admin. Also, right click on My Computer and choose Manage... Oh my ! you are an Admin now managing the PC. Once all is closed, you are back to the simple user as before. That is to give an idea how MS can work like Linux. The beauty is that you have not logged off not even once.
That is how you admin a Linux system, is too easy but people chokes up.
One thing is, hardware manufacturers cater for MS. MS does nothing to make things work, other people do.
If you want a printer that works on Linux right out of the box, pick HP Printers. They have an OS called HPUX (people calls it, H PUX) is Hewlett Packard UNIX. Their printers are Linux / UNIX capable and they have drivers that works with CUPS. I have a Network Laser Jet 1300N and works like a champ on Mandriva Linux over my network. Another piece of hardware that kicks *** is nVidia, they make drivers for Linux and they rock!
Mandriva has some called NDiswrapper that uses MS sys and inf files (Windows Drivers) for wireless cards. How neat is that ! Is all done via GUI and never messed with the Command Console for it.
I only saw one computer that did not liked Linux and was a POS Dell SX260, the rest all loaded just fine.
Now, that GNOME is not as easy as you like? Try KDE. Now, the way they work are NOT Linux fault, is the Desktop Environment people that makes them to work with Linux. Is like blaming a Software company independent from MS for crashing on the Windows system and you blame MS for their crappy OS.