The LinkScanner as a component is not listed in the AVG user interface. You can find there the Web Browsing component which does the same job (if you click the component, you can configure the LinkScanner).
In order to remove to remove the currently installed AVG software and to install AVG 2013 Free Edition, please follow this AVG Forums article.
Please let us know, if you need more information.
Having used AVG free versions for many years, on 07/09/12 I downloaded and installed what I thought was AVG AntiVirus Free 2013 but then discovered I had installed a 30 day trial of the paid for version. The downloaded file was named avg_free_stb_all_2013_2667_cnet.exe
Following a spell in hospital the trial version licence had expired, so on my return home I downloaded avg_free_stb_all_2013_2742_cnet.exe
and installed it on 27/10/12. This was the previously hoped for AVG Free 2013, but I then found it was lacking the Link Scanner component that had been a feature of AVG Free 2012. On Google I found that Link Scanner is now a stand alone program, so tonight I downloaded the CNET link for AVG LinkScanner Free Edition 2013 (avg_free_smf_stb_all_2013_2742_cnet.exe)
However I have now lost the AVG antivirus program - all references to AVG now only display the Link Scanner ui. Can someone please explain exactly what is going on and how do I install BOTH the Antivirus AND Link Scanner programs on my system?