Wow, I didnt think anyone in the world still used version 7.5.
AVG already released version 8, and now are on version 8.5.
Yes they still do a free version, which a lot of people miss and download the trial version by mistake.
http://www.avg.com/filedir/inst/avg_free_stf_en_85_2...
Just follow the instructions on screen when you install it.