You probably have SwCaller as well, a nasty dialler.
My Advice:
First uninstall Kazaa, and look for a spyware-free alternative.
Then do this:
Go to Start/run, and type msconfig.
On the Startup tab, uncheck EVERYTHING, EXCEPT for the following items:
MSMSGS (Optional), Scanregistry, SystemTray, Multi-function Keyboard, LoadPowerProfile, SDaemon VSchedule, PLXSTART* PLXTASK*, V128IID LoadPowerProfile, SchedulingAgent, winmodem* LoadBlackD* Iomega Zip Disk Icons BlackICE* load=*
Click OK, close Msconfig, and reboot (important!)
Now go to Software add/remove and remove New(dot)net application and Webhancer Agent.
Reboot AGAIN.
Download and install <A HREF="http://www.lavasoftusa.com/index.html">Ad-Aware</A> . This is a program which scans your system for spyware.
After having downloaded AAW, also download the latest Signature file (Reflist.sig) :
http://www.lavasoftusa.com/ls/reflist.zip
Unpack it to the Lavasoft Ad-Aware folder in Program Files, and have it overwrite the one that's there.
Then have your drives and registry scanned for spyware, check all found files and reg keys, click continue, and have them removed.
Reboot one last time.
Your computer will thank you for this, and you'll be amazed about how much more smoothly your system will run.
Good luck,