My yahoo messanger is not opening?

My yahoo messanger is not opening. i had reinstall yahoo many time with many version.still not opening.then i format C drive and install windows XP again.but still yahoo is not opening.is it any virus?other programs working fine.i tried to install some anti virus.but the setup file of anti virus also not opening.other software setup files working fine.how can i solve this pblm?any idea?Thanks for reading this

My yahoo messanger is not opening?antivirus software

well if it is as you said it depend on:

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1)Not having fast computer

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2)not having fast internet connection

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3)bad internet service from you country

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4)A problem with you building

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5)Having dangerous viruses

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6)there is a fire wall protecting

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7)You can pass from the firewall from this links:

http://www.megaproxy.com

http://www.freeproxy.com

http://chinagreatwall.com

http://www.googleproxy.com

Note: if any of these sites not coming means your country has blocked it or your internet has an eroor which you must solve it as fast as you can