Trojen.gen.2 and zero.access help

I seem to have this trojan.gen.2 and zero.access virus on my laptop.  I think I am relatively safe since norton quarantines the files, but it pops up every couple of minutes which is quite annoying.  It says the virus is in my C:/windows/installer/

(b65b2da3.39...............} file.

 

It looks like people are getting help here so I would be grateful if someone could guide me in removing this bugger.  The process seems quite complicated i do not think i could figure it out on my own.

 

I am currently running windows 7 SP1 - 32 bit.

 

Hope someone can help.

 

Thanks