Question about Outlook Express

Good morning everyone.

I have Windows 8 64 bit and I've been experiencing an issue with Windows Live Mail, which started a few days ago.

Whenever I open it, a message appears: "Windows Live Mail has stopped working", with the related loading bar looking for online solutions from Microsoft to the problem.
After a while, the loading bar disappears and in the same pop-up two options appear: "Debug" and "Close programs". The first one, if chosen, gives the following message:

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wlmail.exe - Impossibile trovare un debugger.
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Non è stato specificato alcun debugger JIT registrato.

Per mettere in attesa il processo mentre si attiva il debugger manualmente, scegliere Riprova.
Per annullare la richiesta di debug JIT, scegliere Annulla.
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(italian, but it basically says that it was impossible to find a debugger and that no JIT debugger was registered, so if I wanted to put the process in waiting state while I manually activated the debugger, I should've choosen "Retry", else "Cancel").

If I click on "Retry", I can safely continue using the software, if I click on "Cancel" or on "Close programs" in the previous pop-up, Windows Live Mail just closes.

Fact is: the software seems to perfectly work and doesn't stop working when I click on "Debug"->"Retry". But it's annoying to do that every time.

I'm an user with "medium-high" base knowledge of computer software, so I know the basic steps in these cases: repair software, CLEAN uninstall and re-install completely, etc.
I've also deleted the registry keys related to Windows Live Mail before re-installing, and used Microsoft Fix it for uninstalling problems, to delete further windows live keys which I didn't need, for a perfect full re-install.
I've even tried to restore to a previous system restore point, but with no success (all the restore points which would've helped me were.. corrupt!)

This is what the Event Registry says about the error:

Nome dell'applicazione che ha generato l'errore: wlmail.exe, versione: 16.4.3508.205, timestamp: 0x5111f9fe
Nome del modulo che ha generato l'errore: mscorwks.dll, versione: 2.0.50727.7905, timestamp: 0x520b16c6
Codice eccezione: 0xc0000005
Offset errore 0x000f8ec5
ID processo che ha generato l'errore: 0x%9
Ora di avvio dell'applicazione che ha generato l'errore: 0x%10
Percorso dell'applicazione che ha generato l'errore: %11
Percorso del modulo che ha generato l'errore: %12
ID segnalazione: %13
Nome completo pacchetto che ha generato l'errore: %14
ID applicazione relativo al pacchetto che ha generato l'errore: %15

(sorry, italian too, but you get the idea)

A particular thing to note is that, whenever I experience this issue, the above-mentioned log is not the only one. There's also another log about a .NET Framework error, happening at the SAME EXACT time as the previous one:

.NET Runtime version 2.0.50727.7905 - Errore irreversibile del motore di esecuzione (58C101FE) (80131506)
which translates to
.NET Runtime version 2.0.50727.7905 -  Fatal execution engine error (58C101FE) (80131506)

Could it be that it's something related to .NET? How to manage to resolve this? Should I re-install .NET, and how?

Thanks in advance to anyone willing to help.