Why do I get "Windows could not search for new updates" in my Windows 7 Home when checking for updates?

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System restore never works on this computer, I've tried that numerous times before, and it's never possible.

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I run sfc now, although I'm not sure I did it in the elevated command prompt (what does elevated mean?). I opened command prompt and run sfc from there, that's all. When finished I got this result:

Windows Resource Protection did not find any integrity violations.

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Very strange, this morning when I turned on the computer I got a message that Malwarebytes (I have Pro version) has been turned off. When I turned it on, the option "Protection against malicious code" was switched off, and I can not switch it on! All other options are selectable and can be switched on, but not this option.

Last time I was in Manila I had similar problems with strange things happening. Then when I left the problems disappeared. And most often here in Manila I get warnings when connecting to the hotel wifi about insecure network or dangerous connection.

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Something about Facebook is also displayed together with this TLS handshake (Firefox) and proxy tunnel (Google Chrome), and LinkedIn. But only sometimes, and sometimes only Facebook, sometimes only LinkedIn.

I have asked these related questions here at EE:

Has someone taken control of my computer when a Malwarebytes option suddenly can not be switched on?
Is the wireless network unsecure if it says "Can't connect securely to this page"?
How should I get rid of the message "Waiting for Proxy Tunnel..." in Google Chrome?

thes Q can only be answered after the cause is found - so run the suggested tools 'd say

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I run Rougekiller, but it did not find anything. But with Lavasoft, do you mean I should download and install the free anti-virus and do a search? I already have MS Security Essentials, can't I use that instead?

And what about this list (especially Combo Fix)?:

Microsoft Security Essentials
Malwarebytes PRO http://www.malwarebytes.org/
Combo Fix http://www.bleepingcomputer.com/download/search/?keyword=combofix
Rogue Killer http://www.bleepingcomputer.com/download/roguekiller/
Hitman Pro http://www.surfright.nl/en/hitmanpro/
TDSS Killer http://www.bleepingcomputer.com/download/tdsskiller/
SuperAntiSpyware www.superantispyware.com
Windows Defender Offline http://windows.microsoft.com/en-US/windows/what-is-windows-defender-offline
RKill

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Ramin

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Thanks nobus and Ramin. Now after I left Manila Windows Update works as normal again.