[Not_Tech_Smart]

I've confirmed that the software I allowed to be downloaded WAS from Microsoft (their "Windows Feedback Program" which was by invitation). Since I FINALLY found it on their website again, I assume I'm okay with having allowed this. However, I would appreciate having someone far smarter than I respond about the software listed below (especially whether to buy Spyware Doctor or get something else).

I currently have these programs on my computer: Ad-Aware, Spybot, ThreatFire, Avast Antivirus, Windows Defender and Spyware Doctor Free (which says I have some infections), but I don't know whether to trust that one and buy it or not!

Thanks!