Opening iTunes can´t connect my iPhone it shows: No puede usarse este iPhone porque

Question

Please is there anyone who can help me, just after buying new iPhone 3 (8GB) was able to connect to iTunes and now I can´t anymore after 2 weeks.
It shows in iTunes: you can´t use this iPhone because Apple Mobile Device isn´t ???
I looked everywhere in iTunes but can´t see anything that relates to this AMD:
Por favor quién me puede ayudar, tengo un iPhone 3 (8GB) y podia conectar atravez iTunes, ahora despues 2 semanas me sale:
No puede usarse este iPhone porque
el servicio Apple Mobile Device
no está iniciado.
He mirado por todo lado en iTunes y no ve nada en relación de este AMD.

Answer 1

Let's try a standalone Apple Mobile Device Support install. It still might not install, but fingers crossed any error messages will give us a better idea of the underlying cause of why it's not installing under normal conditions.
Download and save a copy of the iTunesSetup.exe (or iTunes64setup.exe) installer file to your hard drive:
http://www.apple.com/itunes/download/
Download and install the free trial version of WinRAR:
http://www.rarlab.com/
Right-click the iTunesSetup.exe (or iTunes64setup.exe), and select "Extract to iTunesSetup" (or "Extract to iTunes64Setup"). WinRAR will expand the contents of the file into a folder called "iTunesSetup" (or "iTunes64Setup").
Go into the folder and doubleclick the AppleMobileDeviceSupport.msi (or AppleMobileDeviceSupport64.msi) to do a standalone AMDS install.
(If it offers you the choice to remove or repair, choose "Remove", and if the uninstall goes through successfully, see if you can reinstall by doubleclicking the AppleMobileDeviceSupport.msi again.)
Does it install (or uninstall and then reinstall) properly for you? If so, can you get a normal iTunes install to go through properly now?
If instead you get an error message during the install (or uninstall), let us know what it says. (Precise text, please.)