I install Avast (along with Firefox) on every PC I work on . . . invariably it's loaded with spyware, never even been to Windows Update and the installed trial version of the A/V has loooong since expired. I'd MUCH rather see Avast on new machines then the trial version garbage that bogs the machine down to a crawl.
Once I'm done, I tutor the customer about security, spyware removal (SUPERAntiSpyware, Spybot & Ad-aware), how to use their new browser and what to expect from Avast. I download an Eicar test file and walk through the use of the chest, cleaning etc.
Thanks for a GREAT product, Avast.