Inactive Certain websites seem blocked

[Lonni Jóns]

Hi. I was instructed by a helpful member of techspot to post this link here:
https://www.techspot.com/community/topics/3-websites-wont-load.201626/#post-1397398
In short the problem is that I can't access certain websites like google dot com, facebook, twitter and amazon (these are the only ones I've found not working so far). The thread explains what guy who was helping me out had me do. Mostly it was doing something to the host files.
This is my original post from that thread:
I was hoping I wouldn't have to post on the forum (I hope I chose the right category to post it in) for advice but after reading endless threads all over the net I am still left with a problem I can't seem to figure out.
Basically, there are 3 websites (that I know of) that won't load on my laptop at home. Google.com, Facebook.com and Amazon.com.
I've tried to disconnect my WiFi and turn my phone into a hotspot but they still won't load. They all work on my phone, both on the WiFi and the mobile network. They also work on other PC's
I use Firefox, but I have tried Internet Explorer, Chrome, Safari and Opera and none of them can open these sites.
A few of the advices I've read and tried are:
Replacing 'http' with 'https'. Did nothing.
Flushing by opening a command box and writing 'flushdns'. I did it correctly and it did not work.
I have my computer set up with a login password (the reason I post this is because I read somewhere that setting a login password might help). This is how desperate I am.
I haven't done a System Restore because the dates offered aren't after this started to happen, which is over a month ago.
I'm from Iceland and for some reason google.is does work.
I have a year old Acer with a Windows 7 64 bit OS.
Is there anybody out there that has the slightest idea of what is causing this?
Many thanks in advance.
Hope that something can point me in the right direction.

 

[Broni]

Welcome aboard

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[Lonni Jóns]

Thanks a lot. I'll look into this very soon.

 

[Broni]

 

[Lonni Jóns]

I think after all I'll try to do a reinstall. I really thank you for the helping me and everybody here. This is a great community of people.

 

[Broni]

Thanks for letting me know