Help, please!

Good Afternoon,
excuse for my english!
I have a problem with Avast.
I unistalled Avast but when I want to install determinate softaware (file setup), a message appear on the desktop in undersystem MS-DOS 16 bit wich say:
" F:\Setup.exe
C:\Programmi\Alwil Softaware\Avast4\aswMonVd.dll. Un driver di perferica virtuale non è riuscito a inizializzare la Dll. Scegliere Chiudi per terminare l’applicazione".

(in english) F\Setup.exe
C:\Softwares\Alwil Software\Avast4\aswMonVd.dll. A driver of virtual peripheric don’t has turned out to initialing the Dll. Select Close for to end the application."

I don’t find the directory C:\Softaware\Avast4\aswMonVd.dll

Tank you, very much…

piviere78@email.it

What operating system do you use?
Do you use ProcessGuard or PrevX?

Does it help if you invoke Control Panel / Add/Remove Programs / avast! Antivirus / Change / Repair?
If you search the board for aswMonVd.dll, won’t it help in anyway?