Virus infected Norton and most of my comp

So about a month about I believe I got an awful virus that pratically destroyed my computer. My Norton Antivirus software has been tampered with somehow because every time I run a scan, it stops after 1 sec with no filed scanned. Also, my LiveUpdate will not work due to some kind of error. Many applications stopped working on my laptop, the icons in my Network Connections folder disappeared, and Windows Installer (and therefore Uninstaller) will not work due to the "WI service cannot be accessed" error. My friend told me he downloaded a patch to fix this virus but I'm not sure which one it is because I'm not sure which virus got to my computer. Can anyone help me?

 

I run Windows XP SP3 on a HP Pavilion laptop. I'm not sure which Norton version I have.