Hey, I only pointed you to a guide - you did all the hard work, glad it worked ok to get rid of the pesky toolbar :)
Because of the 'little spanner' I'm guessing Chrome Browser?
Also I'm thinking that as 'search.certified-toolbar.com' had messed up your homepage of Google Search, you will need to re input the correct Google.co.uk as your homepage.
I would start by changing your homepage to a completely different one, close Chrome, open it again and then change it back to google by going to webpage www.google.co.uk and choosing to set it as your homepage.
Also manually check for updates by clicking the Chrome menu and selecting About Google Chrome, and Update, hopefully that should put back any 'missing bits' of program.
I've never used Chrome so am giving general advice.