Cannot access WP-Admin on single computer(cookie error) all other computers fine

Hi

After moving from an old, slow work computer to a spare computer with twice the processing power – I tried to resume work on my websites.

And then I get the dreaded: ERROR:

Cookies are blocked or not supported by your browser. You must enable cookies to use WordPress.

However, I’m able to access the WP-Admin area without any problem on other computers except this ‘new’ one. I’ve activated/deactivated cookies, cleared the caches, added exception and still no change. It’s not a server or network issue either as it works fine on any other computer – so it’s something to do with my computer (rogue software overriding & blocking cookies?)

Strangely, one of the websites gave me access with no fail, but the other websites I’ve been working on still give me the same error message.
Additionally, I can’t log-in to the wordpress.org site either!! (I’m using another computer for this message of course..)

I know it’s not specifically a WordPress issue but I don’t seem to have trouble with any other sites at the moment, so just wondering if anyone has had the same issue before… ?

(I’m going to run an antivirus scan as we speak.)