Fusion ATL rule check fails installing SQL server 2008 on Windows 7

Hi there

I'm trying to install SQL server 2008 on Windows 7 (unfortunately all italian, trouble translating errors).
The "rule for ATL check" always fails saying "reboot required".
I followed KB 955792 without solving the problem. I'm doing installation with administrator account, it seems that SqlSupport.msi does not install.
On the Event Viewer, "administrative events" ("eventi amministrativi") I found evet ID 33, originated by SideBySide. I paste it here in Italian because "Generazione del contesto di attivazione" in italian menas nothing. Why error aren't always in English?
I try to use sxstrace, but I don't understand the output.

Generazione del contesto di attivazione non riuscita per
"c:\Program Files\Microsoft SQL Server\100\Setup Bootstrap\Release\x86\FusionCheck.dll".
Impossibile trovare l'assembly dipendente Microsoft.VC80.ATL,processorArchitecture="x86",
publicKeyToken="1fc8b3b9a1e18e3b",type="win32",version="8.0.50727.1833".
Utilizzare sxstrace.exe per ottenere una diagnosi dettagliata.

Can somebody help me?

tks and regards

Paolo