Messages stopped working completely

Out of the blue Messages has stopped working - first lost all of my recent conversations and now when I try to send a message by hitting "return" nothing happens.
Is there a way to uninstall and then reinstall just Messages?
Really at a complete loss here.
This is on an old mac book pro, running Mountain Lion of course.

Hi,
It would be useful to know what you have tried.
Start with the Apple Icon menu top left and About this Mac.
Does this show the Serial Number ?
In System Preferences > Date and Time does it show the Automatic server in use ?
Have you set it to the Correct Time Zone ?
In Finder window use the GO Menu whilst holding down th ALT key.
Select the Library that Appears.
Navigate to Preferences.
Find the com.apple.iChat.plist and Drag it to the Trash.
Does the App start now ?
In the Font Book scroll to the bottom of the List and check the AppleGothic Font.
It should not be disabled. It should validate (File Menu) and not be duplicated.
Also check the Helvetica Neue and Lucida Grande whilst you are there.
IF the app will open check the Details Button in Messages > Preferences > Accounts > iMessages account
This should list you Location (county or Region for telephone International codes).
9:06 pm Thursday; February 5, 2015
 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

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Hi,
It would be useful to know what you have tried.
Start with the Apple Icon menu top left and About this Mac.
Does this show the Serial Number ?
In System Preferences > Date and Time does it show the Automatic server in use ?
Have you set it to the Correct Time Zone ?
In Finder window use the GO Menu whilst holding down th ALT key.
Select the Library that Appears.
Navigate to Preferences.
Find the com.apple.iChat.plist and Drag it to the Trash.
Does the App start now ?
In the Font Book scroll to the bottom of the List and check the AppleGothic Font.
It should not be disabled. It should validate (File Menu) and not be duplicated.
Also check the Helvetica Neue and Lucida Grande whilst you are there.
IF the app will open check the Details Button in Messages > Preferences > Accounts > iMessages account
This should list you Location (county or Region for telephone International codes).
9:06 pm Thursday; February 5, 2015
 iMac 2.5Ghz i5 2011 (Mavericks 10.9)
 G4/1GhzDual MDD (Leopard 10.5.8)
 MacBookPro 2Gb (Snow Leopard 10.6.8)
 Mac OS X (10.6.8),
 Couple of iPhones and an iPad

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An error occurred during the installation of assembly 'Microsoft.VC80.CRT,version="8.0.50727.4053",type="win32",publicKeyToken="1fc8b 3b9a1e18e3b",process or Architecture="x86"', Please refer to Help and Support for more information. HRESULT: 0x800736FD
I hope someone is able to help me with this.

Did you already try what bnoir suggested in this post about error 0x800736FD:
These ones are typically caused by underlying problems on the PC that also often cause Windows Updates to fail to install. If we can fix the Windows Update trouble, we can usually get the iTunes trouble cleaned up en passant.
Go into your Windows update and try to check for new updates. If updates install, stock up on the ones you're behind on, restarting the PC if requested to do so. After the restart, try installing iTunes again. Does it go through this time for you?
If windows updates fail to install, go into your Update History and doubleclick the failures. What alphanumeric codes appear for you? Are they also 800736FD, or some other number? (If they're another number, what number are you getting?
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Head into your Windows Update, and check for any new updates. Do any fail? If so, open your Update History and doubleclick on the failure entries to bring up a small box with alphanumeric error message codes. Are you getting 8000FFFFs? (They often seem to be associated with an iTunes-install 0x800736FD.)
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[Windows Update Error 8000FFFF|http://windows.microsoft.com/en-US/windows-vista/Windows-Update-Error- 8000FFFF]
Head back to Windows Update, and stock up on any updates you're behind on. Once you're completely up to date in that regard, try another iTunes install. Does it go through properly this time?
Message was edited by: Ingo2711

Messages stopped working completely

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