Thank you.
I've extracted all files in a folder in C:\ and launched the .exe .. still the same error.
More infos (just in case):
Windows Vista Home Basic SP2 (Italian) with a KSOD (with mouse pointer and nothing else).
- Startup repair doesn't find errors;
- No sytem restore points available (maybe lost, because I'm pretty sure there was at least one);
- Windows Event Logs cleared and Windows Event Log service disabled;
- SFC doesn't find errors;
- Chkdsk [/R] doesn't report anything strange;
- No malware or viruses [Dr. Web + AOSS analysis];
- Tried the RpcSs solution, but it's ok [already NT AUTHORITY/NetworkService];
- No problem with Winlogon Shell registry key [already explorer.exe];
At the moment only sticky keys trick works.
Something weird: the default Windows screensaver starts normally after about 15 minutes..why?

[sorry for my English
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]