Vista Firewall problem

[rdnkjeeper]

I am running Vista home and my firewall won't stay on. I thought I had a virus or some spyware or malware so I scanned with avg 7 (the latest one), spybot search and destroy, and ad-aware. They found a few things, cleaned those up but it is still doing it.

Also ran hijack this and it said one folder couldn't be looked at so I am going to go and run hijack this again and see what folder it is.

Any help in getting this fixed would be great.

Thanks

[rdnkjeeper]

The folder that won't scan is windows/system32/?/?/hosts. I moved the folder to another area. Thinking that maybe it was a virus, but I didn't want to delete the folder incase I needed it. Still happening, any ideas?