What you are getting is spyware and/or viruses.
Follow advice below.
http://service1.symantec.com/SUPPORT/tsgeninfo.nsf/docid/2005033108162039
Above is the link for Norton Removal Tool; if using Norton.
Vista’s Firewall is very good!
http://www.avast.com/eng/download-avast-home.html
Above is a link to Avast Free 4 Home Anti-Virus
It is low resource using, free and Vista 32bit and 64bit compatible.
Only have one (1) anti-virus installed; more than 1 can cause conflicts.
http://www.safer-networking.org/en/index.html
For Spyware removal, use the above link to “Spybot Search & Destroy 1.5.2â€
Download it, install it, update it, immunize your system and scan your
System with it.
http://www.javacoolsoftware.com/
For a non-scanning, but running in the background, Program to STOP Spyware
being downloaded to your Computer, use SpywareBlaster 4, available at the
above link.
IMPORTANT ADVICE: After scanning with the above Programs, if problems
still remain.
Reboot computer, and tap F8 at power on/ startup. From the list of options
that appears, select Safe mode by using the UP and DOWN Arrows, then hit
ENTER.
Rescan the computer in Safe mode.