Maintenance - what´s that?
I think many user do as described here: 14 ways to get Infected without trying
A little bit of humour but also based on fact.
1) Look for cracks, subdivided in illegal software and .....
2) Practice unsafe hex, browse the web for free pOrn
3) Look for software that adds smileys to your posts, mail etc
4) Look for kewl skins, screensavers etc
5) Look for spyware removers, concentrate on the kind that makes you pay before it removes anything
6) Install a P2P program and repeat all of the above
7) You always want the best; use p2p to download anti-virus/firewall software.
8) Do NOT pay for anything, the internet is a place where you can steal anything from everyone without even saying as much as thank you
9) Don't have/use/update antivirus/security software
10) Look for pokergames, slotmachines and other gambling outfits
11) Look for ringtones and other stuff to bling your phone
12) Click on those unexpected links and attachments in email, because you're curious...
13) Do loan your laptop to the next door neighbour for the weekend and give him your Admin account login so he can get his project done with no hassles
14) Let the Babysitter use your laptop for 'schoolwork'