I am looking for an antivirus for Windows XP because I am tired of all that shit that tries to infect my PC. So far I looked into Kaspersky Anti Virus and McAfee VirusScan. Which one is better or should I pick something entirely different?
This is something that doesn't have a correct answer. Everyone has their opinion on the matter. Personally, I use Norton AntiVirus. That's not to say I love it. It works well... most of the time. I've used McAfee in the past and have been very satisfied with it. I guess I would have to recommend one of those two.
Norton Antivirus is not a Spyware remover. Antivirus programs handle viruses. Antispyware programs handle spyware. Antivirus programs may be able to identify some spyware, but they don't typically have the tools to remove them since they are tailored to remove viruses. If you want spyware removers, I can recommend some very good tools that are free.
My top recommendation would be Microsoft Antispyware. This program is good to keep running at all times. It is very good at finding spyware and other malware that is trying to install itself. It also asks whether or not something should be allowed to startup automatically and alerts you of programs trying to change internet settings (trying to hijack your browser).
My next recommendation would be Spybot - Search and Destroy. This program used to be my top pick, but Microsoft Antispyware is better. Spybot has also been getting worse lately IMO. I'd use this as a tool to use if something slips by Microsoft Antispyware. Note: don't install any of the extra tools that Spybot comes with, they are annoying at their best and worthless at their worst.
Ad-Aware is another program I use if my first line of defense fails. I only use it as part of a full line of scans to get rid of tough malware.
To get more assistance, I recommend reading Optimize XP. This guide is very helpful in that it provides information about many tools to help keep your system clean and that it offers many tips on securing your system against future infections. I couldn't recommend this guide enough.