Previous Infection still messing up system? Please advise me if possible :)

Hi all

 

I am writi ng this from my laptop which has the lastest version of NIS 2011 installed 18.5.0.125 but I seem to be having a lot of problems with my computer.

 

It is running vista unfortunately and from the moment i boot up computer it starts freezing and when it does load windows the computer seems like it is constantly working on searching for files and it is never idle.

 

I have scanned with norton several times and found no infection any time just some cookies. I do have spybot installed but only to look for tracking cookies.

 

Can anybody out there give me advise to this vague question? Is there a system tool i can download from norton to access my system and tell me if it has an underlying infection?

 

thanks for any responses.