advent laptop problems

tattoed_bum

hi my laptop has been to pc world to get repaired and now it has come back it wont let me access anything on my favourites it keeps saying that the websites security system has expired ,it wont even let me in if i google the site .
has anyone any idea what this means and any ideas how to get it of the computer please ,

all the security thats on the laptop is all up to date avast at the moment

fwor

Does this happen with ~all~ web sites, or just ones that use SSL (i.e. with an address that starts with https:// instead of http://)?

If the latter and the error relates to an expired certificate, it may just be that you don't have up-to-date root certificates installed. That's quite easy to fix, but IIRC how you do so depends on which browser you're using.

tattoed_bum

this is happening with all sites from asda ,and argos to mse and freecycle so it must be the ones with http://
can i ask what root certificates are ,
the computer was used daily until it was repaired

fwor

tattoed_bum wrote: »

can i ask what root certificates are

They are... irrelevant to your problem! SSL works by the web site presenting a digital certificate to your browser, which your browser checks to see if the certificate was issued by someone it trusts. It does that by checking it against a list of root certificates. If it finds a match then it knows that it can trust the certificate, and therefore the web site.

Shame that none of that helps with your problem, though...