Computer security systems and confusion?

I have a Dell Inspiron 6000 that has crashed before, been fixed and wored like a charm, last night I read about viruses and trojans and freaked.
So as I looked through my comp I found no Anti- spyware! I did however find that I have AVG- free Anti- Virus and a Windows Security Firewall on… I never had a virus in the vault with a AVG so never any worries… and my AVG keeps updating every time the comp starts up… I was still skeptical so I downloaded Spyware Doctor and it found 306 infections! I deleted all of them and I dont even know what they were! I read it was good to have two anti- spyware systems so I downloaded AVG Anti-spyware which found 39 more! Some were with my google toolbar.
So my issue is that my comp is slower starting up and opening folders… my Internet is also slower and I wonder if I need two anti spyware with windows firewall and anti- virus? Did the stuff I deleted need to go? and how do I look at my DNS? What files can be deledted on my comp?

You still have hidden spyware, eating your memory resources…
Free products aren’t always reliable and why in the world do you use Windows Firewall?
Read here for firewall

http://www.matousec.com/projects/windows-personal-firewall-analysis/leak-tests-results.php#firewalls-ratings

www.toptenreviews (.com) > Software > Firewall

And Use Webroot Spyware Sweeper (Paid version ,or free version best for anti-malware) + Threat Fire
+ Use Counterspy (Free version for, best for spyware)
+ Ad-Aware(Best for Adware)
+ SuperAntiSpyware (Additional anti Spyware Detection)
+ TuneUp Utilities 2007/Advanced WindowsCare Personal (On pro website you can see the comparison)

AVG???

http://winnow.oitc.com/AntiVirusPerformance.html

Now get Avira! Anti-Virus

Wow annoying people amaze me, with their thumbs down.

Never use two anti-viruses, however you can use more than 1 anti-spyware/malware/trojanware/adware, because 2 anti viruses will fight eachother to scan more, by that using all your memory, and even slowing it down more, and it collides, so you might not be protected, if it is fighting eachother.

Did the stuff I deleted need to go?
Yes, it was overwrriten by AVG and it was killed.
and how do I look at my DNS?

http://www.kloth.net/services/dig.php

What files can be deledted on my comp?
Use Advanced Windows Care Personal/CC Cleaner to delete files on you computer and remove junk along with Iobit SmartDefrag

System Security 2009 Analysis and Removal

Spy Net: Spy Strike Laser Dueling System $22.99 Hone your sharp shooting skills and train like a top spy with Spy Net Laser Strike. Laser gun fires invisible infrared beams to target your opponent; target sensor can be worn for head to head play or set-up as a target for solo training. Ages 8+. Product Features 2 set of laser gun and sensors Laser tag game for Spies Solo Training Mode Head to Head Battle Mode…

Spy Motion Alarm $8.98 Detect Movement up to 20 Feet Away The Micro Spy Motion AlarmTM detects even the slightest vibration and works best on doors and windows to keep intruders out. Can be placed on your bike, backpack or books to catch spies in the act. Battery Requirements: Requires 2 AAA batteries, not included….