Spysweeper came recommended from the conglomerate where I purchased my laptop. I bought it and maintained membership for about two years. It annoyingly popped up on every boot, but although I never received any messages of any serious threats, I never had any spyware problems. I did not renew, and blamed that on losing an entire hard drive to spyware.
Recently, my new hard drive was attacked by Virus Protect, which is a powerful and malicious spyware trojan. I re-installed and renewed Spysweeper, and upgraded for maximum protection. It removed three threats, but I later found there were near thirty in all, so it was ineffective. I wrote to customer support and they advised me to buy all the obvious upgrades that I had already purchased. They must not have read my message.
When I bought another program, it found and removed the entire infiltration from Virus Protect. I ran a Spysweeper scan at the same time to compare results. Spysweeper was pitiful. Don't bother buying it. It will give you a false sense of security until the day you are attacked, and when that day comes, Spysweeper will be about as effective as a bucket of water on a raging housefire.