Excessive Log Files(.cab) - Problem comes back with CCleaner or manual

always post upto date info
as you said in your first post configuring updates is continuall, not a good sign.
please review your INSTALLED update list, you should have some dated this week.

Roy

@torchwood: thanks for the suggestion, but I have actually stopped updating Windows 7 ever since Microsoft added unwanted and unannounced features such as harassing me to upgrade to Windows 10 and what seems to be telemetry spyware.

And this started happening long before these updates came into existence. I have the system set to not check for updates. You can find attached to this post a file listing my current updates on this system.

If your system is running smoothly then i would delete them.
BUT there should be a .cab file, does it show in the current folder
There is a list of W10 related updates and the info on removal here
How to remove Windows 10 upgrade updates in Windows 7 and 8.

You could run
sfc /scannow
the SURT tool
http://support.microsoft.com/kb/947821
and disk clean-up

Roy

Using the Windows PowerShell utility, I could see that none of the bloatware for Windows 10 was installed.
I executed sfc /scannow previously and it did not find anything.

Now, about this SURT tool you mentioned: http://support.microsoft.com/kb/947821
Is it safe to install considering that I wish to not update the system further?

It is a 550 MB file: Windows6.1-KB947821-v34-x64.msu. What does it do exactly? (I mean under the hoods as well)

Thanks for the help so far!

it just looks over your system and produces a report, you run it as and when
Roy

@torchwood: it seems that system checker worked.
TrustedInstaller (and svchost) are no longer eating 25%+ CPU and the CBS disk usage stabilized: it now holds small .cab files as it is supposed.