uninstalled MAC Bridge Miniport and Realtek PCIe FE Family Controller cannot install them again

hello

i am using dell inspiron n5050 and windows 7. yesterday i uninstalled MAC Bridge Miniport and Realtek PCIe FE Family Controller. i read a article on how to install MAC brigde miniport through the following steps:

1. Go to device manager and select "Show Hidden Devices" under the View menu.

2. Expand Network adapters. You should see the WAN Miniport (PPTP)

3. Try right clicking on it and uninstalling it. More than likely it
won't allow you to. To get around this update the driver to something "uninstallable" like the MAC Bridge. To do this right click on it and select update driver. Choose no to look on windows update. Then choose to specify a location. Next choose dont search. Next unselect show compatible hardware and find the MAC Bridge under Microsoft. Force it to install it. After thats done you should be able to uninstall your new 'MAC Bridge Miniport."

4. Now that it's gone, lets reinstall it. Go fetch the devcon.exe
package from Microsoft (Search for devcon.exe on google) and extract it somewhere.

5. Go to the command prompt / console (cmd.exe) and get to the folder
with devcon.exe in it.

6. Run this command: devcon.exe install c:\windows\inf\netrasa.inf
MS_PptpMiniport

7. Go back to the device manager. You should see the WAN Miniport
(PPTP) back.

so i updated/change my wan miniport (PPTP) to Mac bridge miniport but i was not able to get wan miniport (PPTP) back as i did not understand  how to do step 5, 6 and 7. And i am not able to install Realtek PCIe FE Family Controller again..

plz help..


this the image of network adapters in my device manager