By eradicating the adware on your computer.

You can show your computer to a professional (make the kids pay for it)
or you can try this: HijackThis is a program that searches your computer
for signs of infection. The program produces a detailed log that you can
submit to volunteer experts free of charge for analysis. More
information here:

http://www.whatthetech.com/hijackthis_v2/

You can post your HiJack This logs in several forums (NOT here), such as
 this one:

http://forums.whatthetech.com/HijackThis_Logs_and_Infections_Removal_f27.html

---
Leonard Grey
Errare humanum est

Do a _thorough_ check for malware, following all of the steps at one of
these Web pages.
Help with malware:
All  MS-MVP Sites.
http://aumha.org/a/parasite.htm
http://aumha.org/a/quickfix.htm
http://www.elephantboycomputers.com/page2.html#Removing_Malware
http://mvps.org/winhelp2002/unwanted.htm
http://inetexplorer.mvps.org/darnit.html
http://www.mvps.org/sramesh2k/Malware_Defence.htm

Unexplained computer behavior may be caused by deceptive software.
http://support.microsoft.com/kb/827315

So How Did I Get Infected Anyway?
For quite a few people it's by installing programs like Messenger Plus,
whose ads for malware don't identify the malware as such and try to convince
you that you owe it to the author.  See also:
http://www.wilderssecurity.com/showthread.php?t=27971
Don't ever do a "default" install of anything.  Always choose Custom and see
what else is being carried along.  Don't install any extras you're not sure
of.

1. Run Deckard's System Scanner (DSS)
http://securitynewsfromthenet.blogspot.com/2008/06/deckards-system-scanner-dss.html

2. Run the vundo and combo fix
http://securitynewsfromthenet.blogspot.com/2007/05/vundofix-and-combo-fix.html

3. Run Malwarebytes Anti-Malware
http://securitynewsfromthenet.blogspot.com/2008/03/malwarebytes-anti-malware-105.html

4. Run the anti spyware removal programs spybot
http://securitynewsfromthenet.blogspot.com/2007/03/spybot-search-and-destroy-spy
ware-and.html

5  Run Superantispyware
http://securitynewsfromthenet.blogspot.com/2007/04/superantispyware-home-edition
-free.html

6.  Run a complete scan with free curing utility Dr.Web CureIt!
http://securitynewsfromthenet.blogspot.com/2008/05/dr-web-cureit.html