old computer doesn't allow updates and blocks every internet page?

[Rammy]

I've been given a computer by a friend and I'm sure it's over 5 years old, ADVENT make and running windows vista. I don't know which internet explorer version it's running but recommends I update to version 9 (hopefully that'll help in aging this thing).

I've got a belkin surf n300 internet stick as it won't connect to the internet as a wireless device.

I'm tying to download Skype but everything seems to be going wrong.

I've followed instructions to update my windows
And can get as far as

Control panel > security > windows update

But when I try to update it comes up with

Errors found:
Code80072F8F


And this isn't recognised in the "get help" tab.

When I try to go online and update my internet explorer it recommend internet explorer 9 but I cannot update as all pages I try to open (even googles home page and microsofts homepage) I'm met with a tab reading

Certificate error: navigation blocked

I can either close the window or continue which isn't recommended and when I do continue the search bar turns red and another bar pops up saying

To help protect your security, internet explorer has blocked this website from displaying content with security certificate errors

I can choose to show blocked content but it absolutely refuses to let me update both my windows and my internet explorer.

Any solution would be highly appreciated

[BC_Programmer]

Are the time and Date correct on the system? 80072F8F indicates that it couldn't establish a secure connection, and the same applies for certificate errors- both can be caused by the time and date (or time zone) being incorrect.

[Rammy]

... I am an idiot. I never even checked XD I'll check and change it now

Thank you so much for the tip!