Do I really need a security software besides windows security?

If I uninstall my norton and just stay with windows security, my friend says that you dont need norton firewall and only need antivirus if you download files from some unknown websites... is this true?

also is there an online website where i can check a file for viruses if I didnt have an antivirus software on my comp?

Do I really need a security software besides windows security?nortan antivirus

You should have an anti virus and a couple of anti spyware programs.

These are theones I use.

All of these are ones that I personally use and all are free.

AVG Removes I-Worm/Stration · BackDoor.Generic3.GBB and .GBC · Worm/Generic.FX · Exploit.WMF

http://free.grisoft.com/doc/5390/lng/us/...

Spybot - Search %26 Destroy detects and removes spyware, a relatively new kind of threat not yet covered by common anti-virus applications. Spyware silently tracks your surfing behaviour to create a marketing profile for you that is transmitted without your knowledge to the compilers and sold to advertising companies. If you see new toolbars in your Internet Explorer that you haven't intentionally installed, if your browser crashes inexplicably, or if your home page has been "hijacked" (or changed without your knowledge), your computer is most probably infected with spyware. Even if you don't see the symptoms, your computer may be infected, because more and more spyware is emerging. Spybot-S%26D is free, so there's no harm giving it a try to see if something has invaded your computer.