First you need to stop the Kazaa ap from loading when Windows starts.
I recommend Startup Inspector to manage your startup menu because it identifies the programs so you can disable the ones that aren't necessary to load until you want to use them, like Realplayer, Quicktime, Office, Word, etc.
Startup Inspector (manages startup menu – helps you identify aps in the startup menu so you can disable unnecessary programs from running in the background when they are not needed)
Startup Monitor (a small freeware ap available on the same page to notify you and require your permission for any program to add itself to your startup menu)http://www.windowsstartup.com/download.php
Disable the Kazaa program and others that are not needed to be running in the background taking resources.
Be careful not to disable your anti-virus program, anti-spyware aps and firewall.
After you disable Kazaa reboot into safe mode by tapping the F8 Key as you start your computer. You must do this before Windows starts.
Once you are booted into safe mode go to your control panel add/remove programs and remove the Kazaa program.
Reboot your computer into normal mode.
I suggest you update and run a scan with your anti-virus program, Adaware and Spybot Search and Destroy because P2P programs like Kazaa are the greatest source of malware infection there is.
You should download, install and update all of the following:
Ad-Aware SE Personal - freeware http://www.lavasoft.com/
Click on Adaware SE Personal in “Products” on the left side of the page
Or it may be easier to find it here:http://fileforum.betanews.com/detail/Adawa...nal/965718306/1
Spybot S&D: http://www.safer-networking.org/en/index.html
Be sure to enable “Teatimer” which gives you realtime protection against malware invasion. (absolutely necessary)
Microsoft Windows Defender http://www.microsoft.com/athome/security/s...re/default.mspx
This also provides realtime protection. (absolutely necessary)
Ewido Antispyware Freehttp://free.grisoft.com/doc/20/lng/us/tpl/v5
Microsoft Malicious Software Removal Tool (Win XP and Win 2000):http://www.microsoft.com/security/malwareremove/default.mspx
Do scans with several of them until you are sure no malware remains.