norton internet security trial version?? help needed

hello,

   can anyone tell me if norton internet security trial version is as effective as paid one.....coz im currently using trial version which came free along with the windows cd.. and i still have 30 days left so i dont want to waste these free days..

 actually the problem is that it is unable to resolve some tracking cookies properly...when ever i scan it claims having resolved these cookies but the next scan perormed immediately after the 1st one again detects them...

     im not very technical regarding these matters so any help would really be appreciated..thanx