What can i do if i have an antivirus up to date and is not able to take adware and spyware out of my computer?

I have McAfee Security center up to date and is not able to take adware and spyware out of my computer. The yahoo spy toolbar is telling me that i have ISearch (Spyware) and ImIServer IEPlugin (Adware). Is it dangerous to use this computer and internet while i have these in my computer?

Anti-Virus is not good at removing spywares,adwares,trojans and pop up.In fact, The best way to get rid of spywares,adwares,trojans and pop up is using a best anti-spyware to protect your computer.You must have 1 or 2 antispyware on your computer to protect your computer.Of course there are many solutions exist, all of them with their own strengths and weaknesses.So which anti-spyware is the most suited for your system? You can find out by reading in-depth reviews and comparisons of TOP 5 anti-spywares… some really great tips and links to Spyware removal programs.
Top 5 anti-spywares reviews,comparisons and download links on

http://www.top5antispyware.info/index.php?t=top5an1

You can download and scan your computer for free.