How can I deal with the Adware injection?

My desktop appear a notice message “Your computer is in danger! Windows Security Center has detected spyware/adware infection! It’s strongly recommended to use special antispyware tool to prevent data loss” in the black background.I can’t change the background anymore. I try to use NoAdware but nothing change. Sometime, suddenly a wizard auto appear to invite me see some scan adware tools but I always Cancel b/c I think it’s a trap, surely, I was trapped when I agreed to use the introduced scan tool before. How can I do to fix my computer? Please help me.

You have spyware.. download ad-aware se personal from www.lavasoft.com then download and install spyware terminator from www.spywareterminator.com. install both these programs..update them and then run a complete system scan. When all is done download cyberhawk from www.novatix.com to prevent spyware,adware,keyloggers,viruses,worms and trojans uot of your computer.
Good luck!

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Privacy Expert Suite $14.89 Format: BoxAge: Platform: Windows A complete anti-spyware and security solution! Product Information The award-winning security suite that guarantees data security and user confidentiality by protecting standalone machines and PCs connected to the Internet. Privacy Expert Suite integrates a powerful anti spyware tool with Internet and Windows system cleanup, a popup blocker, data destruction and…