Windows Vista SP2 installation problems: error code 0x800b0100

As always M$ doesn't seem to care about its clients. Tried to upgrade Windows Vista, but got the following error
error trust_e_nosignature (0x800b0100)

Although the error code is known, the update suggested to read about 10 topics, and the one with this error code was not even in the first 3 mentioned topics.

The M$ web-site suggests to remove all security software. I removed my antivirus and firewall and it didn't help. Then I removed most of the software installed and disabled other from starting at boot. It didn't help either.

Then I tried to boot in the Safe mode, but that didn't help to install the upgrade again.

My log %SYSTEMROOT%\Logs\CBS\CheckSUR.log didn't help me much:

=================================
Checking System Update Readiness.
Binary Version 6.0.6002.22359
Package Version 8.0
2010-06-11 13:16

Checking Windows Servicing Packages

Checking Package Manifests and Catalogs
(f)	CBS Catalog Corrupt	0x800B0100	servicing\Packages\Package_1_for_KB976767~31bf3856ad364e35~x86~~6.0.1.1.cat		
(f)	CBS Catalog Corrupt	0x800B0100	servicing\Packages\Package_for_KB976771_client~31bf3856ad364e35~x86~~6.0.1.2.cat		

Checking Package Watchlist

Checking Component Watchlist

Checking Packages

Checking Component Store
(f)	CSI Payload File Missing	0x00000000	win32k.sys	x86_microsoft-windows-win32k_31bf3856ad364e35_6.0.6001.22682_none_b928a137b3e36d83	
(f)	CSI Payload File Missing	0x00000000	win32k.sys	x86_microsoft-windows-win32k_31bf3856ad364e35_6.0.6002.18253_none_baa6e66297d2e861	
(f)	CSI Payload File Missing	0x00000000	win32k.sys	x86_microsoft-windows-win32k_31bf3856ad364e35_6.0.6002.22396_none_bb08445bb10e43f4	
(f)	CSI Payload File Missing	0x00000000	win32k.sys	x86_microsoft-windows-win32k_31bf3856ad364e35_6.0.6001.18468_none_b8baa41a9ab030ba	

Summary:
Seconds executed: 1140
 Found 6 errors
  CSI Payload File Missing Total count: 4
  CBS Catalog Corrupt Total count: 2

Unavailable repair files:
	servicing\packages\Package_1_for_KB976767~31bf3856ad364e35~x86~~6.0.1.1.mum
	servicing\packages\Package_for_KB976771_client~31bf3856ad364e35~x86~~6.0.1.2.mum
	servicing\packages\Package_1_for_KB976767~31bf3856ad364e35~x86~~6.0.1.1.cat
	servicing\packages\Package_for_KB976771_client~31bf3856ad364e35~x86~~6.0.1.2.cat

M$ web-site doesn't offer KB976767 or KB976771 for download.
support.microsoft.com/kb/976767 and support.microsoft.com/kb/KB976771 contain just list of files, like that could possibly help.

KB976767 or KB976771 are related to .NET Framework 3.5. Will removing .NET framework or re-installing it help? No!

Can you download windows6.0-kb976767-x86.cab and windows6.0-kb976771-x86.cab from M$ web-site? No!

Re-installing Windows Vista or doing an in-place upgrade? Is it a real solution? Nothing better has come up for more than 8 months? Is it a way of forcing to upgrade to Windows 7???

http://social.technet.microsoft.com/Forums/en/itprovistasp/thread/c2b27476-b6c4-4e17-bd86-b48c2b318d31