In short I've done the followings:
- deleted IconCache - did not help
- reset folder views - did not help
- turned off file sharing and network discovery - did not help
- made a clean boot (turned off all non MS services in msconfig) - did not help
- ran sfc - did not found any violations
- created new user account - did not help
- updated the BIOS to the latest version - did not help
- updated the VGA driver to the latest version - did not help
- turned off file indexing - did not help
- ran Windows 7 in Safe Mode (without Networking): it seems the issue does not occur (hard to say never occurs, long time test needed - but in Safe Mode it's a bit backward).
Microsoft's answerers marked it is a known issue of Windows 7!
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