3 trusted, tested, tried and true links to get your updates on. Smartphone/Apple/Mac/Unix users need not apply.

Microsoft Windows Update
I update my O/S, so up yours.
windowsupdate.microsoft.com

Microsoft Office Update
Just in case you forgot to update it.
o.ms.com/en-us/downloads

Secunia Online Inspector
Don't ask, don't worry, just do it. It's safe.
secunia.com