Your computers might just be Clicking on Too many Bad links and other kinda Stuff...
Try Cleaning up your computers from Spyware etc. Do a Disc Cleanup, Defrag, Cache etc. etc...
2 Top rated FREE products to Do the job and more... (millions & billions of downloads)
http://www.lavasoft.de/ms/ad_aware_free.php
http://www.ccleaner.com/
http://www.ccleaner.com/features
Options allows you to Keep the Cookies you want and Setup the features you prefer...
After you Cleanup your own Computers...
Get out there and Start Servicing other computers...
Many are Doing it with the addition of Virus removal and protection... $19.95 to about $59.95 or so per Service Call plus Backend Sales of other products...
Some do it by Using their Secret CD's in their back pockets and other Creative online & offline ideas/techniques...
10 Calls a Day = $$$$Thousands Weekly/Monthly...
Phil