Installation problems on clients side...

Hallo!
There is a problem: I created an installation package for a client as .msi, now I’m trying to install it on the computer, everything is fine, but after rebooting there is no avast icon in tray, … Start/programs/ avast! Antivirus (managed)/ empty
and avast services - running… so I tried to reinstall it, but nothing happened, uninstallation failed too… after rebooting - avast services running…
please help! why is there such a problem?

also
Control Panel → Add/Remove Programs → there is no avast! Antivirus (managed)

What is the size of the MSI package?
Is it the latest version of the netclient? (i.e. has the MSI file been created after the mirror has been populated with the latest version)?