quick glance of the log shows nothing spyware/adware wise..
of course, as you add more programs to your startup list, it'll gradually bog things down..
to me, norton might be the cause of it.. it's a notorious resourse hog..

to me, if you don't want to use a free AV like AVG.. and prefer to pay, then I'd pay for
kaspersky.. it's relatively low on the resources and quite good on the coverage.

and just my opinion.. trash zonealarm in favor of kerio or sygate..