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Today i have installed google drive but i couldn't get to sign in because i had a blank sign in page. I have discovered looking on the internet that it uses IE core to show web pages (as described here: Can't sign in to google drive (UI is blank) )

So i have opened Internet Explorer (which i never use) to check if something was wrong and i have discovered that it won't load content from google and other sites.
I can go on some websites just fine, at first i thought i couldn't go on websites which had content from google (such as google analytics code) but then i realized that wasn't true.

i can go on bing, but not google (tried maps, gmail and drive) nor yahoo (tried yahoo answers too). There is a case where i can go on a site but not on a subdomain of that site (which made me first think that i couldn't reach sites with google analytics).

The page remains stuck on "Waiting for google.com" indefinitely, it won't even give me a connection timed out error or something, just keeps loading.

Chrome and Firefox work fine, IE 8 on another PC works fine, and so does IE 11 on another PC
So far I have

Checked:

- firewall (Comodo, Windows firewall is down)

- restricted sites

- hosts file

- i'm not running under a proxy

- i have Google DNS as DNS

- i have no add-ons installed on IE

- Windows update

- enanched protected mode (which wasn't enabled)

Tried:

- rebooting

- clearing cache

- Clearing cache and then rebooting

- I have even tried the "troubleshooting" functionality in the Control Panel but it couldn't find any problem

- reseting IE 11 then rebooting

So, it turned out that the "certain sites" were sites that used a secure connection (https) or that had content coming from a secure site (such as google analytics if you use https as prefix in your code).
In "Internet Options" i went to "Content" and clicked on "Clear SSL state". This did the job

More detailed instructions can be found here http://support.microsoft.com/kb/967897 where it says "I can't access my bank or other secure websites"

When you connect to a secure website, Internet Explorer uses an
encrypted channel that uses Secure Sockets Layer (SSL) technology to
encrypt transactions. Corrupted information in the SSL can cause
websites not to load correctly. Clearing the SLL state may resolve
this problem. To do this, follow these steps for your version of
Windows. Windows 8

Swipe in from the right edge of the screen (if you're using a mouse, press Windows logo key+C keys), and then tap or click Search.

Enter Internet options in the search box, and then tap or click
Settings.
In the search results, tap or click Internet Options. Tap or click the Content tab, and then tap or click ClearSSL state.

Windows Vista and Windows 7

Click the Start button, type Internet Explorer in the search box, and then, in the list of results, click Internet Explorer.

In Internet Explorer, click Tools, and then click Internet Options.

Click the Content tab, and then click Clear SSL state.

If clearing the SSL state does not resolve the problem, the date and
time settings on your PC might be incorrect. Some secure sites require
that the date and time on your PC match the date and time of the
website. To check the date and time, follow these steps for your
version of Windows. Windows 8

Swipe in from the right edge of the screen (if you're using a mouse, press the Windows + C keys), and then tap or click Search.

Enter date and time in the search box, and then tap or click Settings.
In the search results, tap or click Date and Time, and then tap or click Change date and time.
In the Date and Time Setting window, set the current date and time.
Click OK, click Apply, and then click OK.

Windows Vista and Windows 7

In Control Panel, open Date and Time. To do this, click the Start button, type date and time in the Start Search box, and then click

Date and Time in the Programs list.
Click Change date and time.
In the Date and Time Settings dialog box, set the date and time to the correct values.
Click OK two times.

If you still can’t access secure websites, get help from the Microsoft
Community online.