Cannot disable proxy permanently

Hi all!

I've just joined this forum so that I can gather information about my current problem.

As the title says, I cannot disable proxy permanently.
I go to Control Panel > Network and Internet > Internet options > Connections > LAN and I see what the image displays here. Nothing special so far.

I untick Use a proxy server for your LAN. Click Ok, and I quit Control Panel.
If I visit the same panel 2 minutes later, this option is enabled again.

And because of this, I cannot disable proxy on Google Chrome, either.

I've tried many things to solve this problem.
For example, I went to Advanced, and deleted everything there. I clicked OK, then an error message popped up saying: Do you want to turn off proxy connection? I click yes- I go back 30 sec later and it's enabled again.
I even tried some tricks in registry. Still nothing.

I want to disable it permanenty, as it's my private computer, using proxy isn't useful for me.

Any ideas? Why does it always come back?
By the way, I use WiFi connection.

I tried, but Chrome does not have this about:config page anymore.

I checked in Firefox, it's 0 on default. If only that was the browser I use daily..

No ideas?

As I said, I've tried that many times, but once I close the window and go back, the tick is there again.

A Guy said:

This can be caused by malware, or security programs, etc. You'll want to do some scans to make sure.

D/L AdwCleaner and run it

AdwCleaner Download (Choose the Download now @BleepingComputer link)

Follow Jacees instructions to run AdwCleaner (ignore the title of the thread)

Blinking OS! Every keystroke or mouseclick causes chaos

D/L and run Malwarebytes Free (Decline the trial offer when installing)

Malwarebytes | Free Anti-Malware Detection & Removal Software

See what these programs find, we may need a security expert if there are issues.

A Guy

Thanks for the answer!

Malwarebytes is already installed, and it's muuch better than Microsoft Security Essentials.
It doesn't find anything now, though.
I am going to install the programs you listed and see what happens.