spyware problem – urgent help/advise great appreciated!!!?

a “system error” keeps on popping up on my laptop screen

it says

” Your computer is infected with a dangerous virus

Note: strongly recommended to install antispyware program to clean your system and avoid total crash of your computer.

click ok to download antispyware”

so what do you think? how can I fix this? it is annoying and I have no idea how serious this warning is? do they just want me to buy their anti-spyware/program?

I have installed Mcafee security, Spybot search and destroy, Lava soft Ad-aware and Ccleaner, are those software not enough to clean my system?

please help!

thanks

security programs can’t detect ‘dangerous virus’ because this system alert pop-up is fabricated. however your antispyware should detect the rogue application that loads ‘dangerous virus’ pop-up. update your antispyware and run a scan again. if that doesn’t help i strongly recommend manual removal tutorial at http://www.2-spyware.com/remove-dangerous-virus.html

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