Answers:
First un-install any previous interpretation of AVG or any other anti-virus software as have multiple anti-virus programs can conflict and construct your system slow. Now download and install the free journal of AVG from free.grisoft.com
Need a short time more information. Do you aim reinstall it? You would simply step to the site and redownload it.
If you still enjoy the installation folder on your computer, double click it and it will ask you to Repair or Reinstallation. You engender the choice. Repair will fix any of AVG files that are corrupt and continue your AVG history.