My Windows 7 met some virus!!!!

Hello,
I am Zhaoguang Chang. At Canadian Boxing day in 2011, I bought Acer laptop. The operation syatem is windows 7. I like it very much. But recently my computer met some problems with virus. The internet explorer run very slowly. Now it can not run. In addition,
it always pop up another windows suddenly, The problem affect my work and life. Can you tell me how do I
solve it? If I install the windows 7, how do I do? Can I download windows 7 without any fee? Because my computer use copyright software when I bought my Acer computer. Or can you suggest me to use the anti virus? Thank you very much!
Please send me the Email to the address at" {removed PII}hotmail dot com "Thanks again.

1)First, identify the virus by name by running your antivirus program. If you don't have an antivirus program or if your program doesn't detect the virus, you might still be able to identify it by looking for clues about how it behaves. Write down the words
in any messages it displays or, if you received the virus in email, write down the subject line or name of the file attached to the message. Then search an antivirus vendor's website for references to what you wrote down to try to find the name of the virus
and instructions for how to remove it.
2)you can download online free
Microsoft Safety Scanner .. click Download Now, and then follow the instructions on the screen.
3)you can also try different online scanner, follow the links to other companies that provide them on the windows security software providers webpage.
http://windows.microsoft.com/en-US/windows/antivirus-partners#AVtabs=win7
4)After the virus is removed, you might need to reinstall some software or restore lost information. Doing regular backups on your files can help you avoid data loss if your computer becomes infected again. If you haven't kept backups in the past, we recommend
that you start now. To learn how to help protect your computer against viruses in the future, see
http://windows.microsoft.com/en-us/windows/how-protect-computer-from-viruses#how-protect-computer-from-viruses=windows-7

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