Do I have enough computer security on my PC? How about some free security programs?

I have a laptop using Windows XP2 which I use regularly at random networks from a fraternity house, in college classes, to my home. Needless to say, I am not sure how secure the networks are:

These programs run at system start up:
Total Security: Paid Norton Security Center
AntiVirus: Free AVG AntiVirus
Firewall: Free Zonelabs Zone Alarm

These programs run once a week:
AntiSpyware: Windows Defender Beta, LavaSoft AdAware, and Spybot Search & Destroy

I run Limewire for P2P now and then. I browse the internet with FireFox. I update regularly for windows, firefox and all of my security. I also game regularly online.

My question is: does this sound safe? What else can I do? I dont want too many intrusive programs taking up tons of RAM, but I would like to be secure, as this new laptop is my only computer. Are there any free programs out there for college kids that are good for protection? Or do I have enough stuff running to protect me?
Thanks all.

Spyware, Adware, Trojans, Malware, Dialers, Popups:

http://www.lavasoftusa.com/software/adaware/

http://www.ewido.net/en/download/…

http://www.javacoolsoftware.com/spywareblaster.html

http://www.download.com/Bazooka-Adware-and-Spyware-Scanner/3000-8022-10247782.html

http://www.javacoolsoftware.com/sgdownload.html

http://www.safer-networking.org/

http://www.download.com/HijackThis/3000-8022_4-10379544.html

http://www.emsisoft.com/en/software/download/

Online Scanners:

http://www.webroot.com/consumer/products/spysweeper/freescan.html?

http://www3.ca.com/securityadvisor/virusinfo/scan.aspx

http://www.pandasoftware.com/products/activescan.htm

http://www.bitdefender.com/scan8/ie.html

http://www.windowsecurity.com/trojanscan/

http://www.kaspersky.com/virusscanner

http://www.spywareguide.com/onlinescan.php

http://housecall65.trendmicro.com/

Spyware, Adware, Trojans, Malware, Dialers, Popups List:

http://www.softpedia.com/catList/104

Antivirus:

http://www.grisoft.com/

http://www.avast.com/

Antivirus Lists:

http://www.softpedia.com/catList/1

Firewall:

http://www.zonelabs.com/store/content/company/products/znalm/freeDownload.jsp?dc=12bms&ctry=US&lang=en&lid=staticcomp_za

Firewall Lists:

http://www.softpedia.com/catList/97

IP Blocker:

http://prdownloads.sourceforge.net/peerguardian/pg2-050918-nt.exe?download

System Cleaner:

http://www.ccleaner.com/

System Cleaning List:

http://www.softpedia.com/catList/98

System Info:

http://www.softpedia.com/catList/92

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