Run a free scan at http://usa.kaspersky.com/products_services/free-virus-scanner.php
Only god will know.
Are you sure you know what malware is? If you have to ask in an open forum such as this you obviously don't. I don't think you're ready to be a script kiddie.
You would need to know the exact files that the malware virus has infected and be able to delete them. This would be very difficult, time consuming, and dangerous to your operating system.
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i am only 10, but i know you can
Download MALWAREBYTES.EXE from malwarebytes.org and run it on your system. It is free. You may have to run it in SAFE mode, if the malware won't let you run it. Malware developers know that malwarebytes will get rid of almost all malware and often put code in their programs to prevent it from running. That will get rid of any malware you have. Usually this is caused by malware on your computer.
An anti-malware program from a trusted organization like IObit or AVG should do the trick. If that does not solve the problem it may be necessary to unlock the system files and delete the malware directly from the root.
Malware Malware
Malware do not download
Malware can be very harmful to your personal computer so firstly you need to scan your PC frequently with a strong virus detector such as AVG or Avast to see if the threat still remains, then to be on the safe side, I would strongly recommend an anti-malware software, specifically designed to get rid of dangerous malware. The most popular is Malwarebytes Anti-Malware. It's also important to back up your files regularly in case you happen to encounter a virus that got into your computer before you had any anti-malware support or was able to hijack your computer via the Internet. In the case that you didn't back up your files and you don't want to buy a new computer or sacrifice all your important files, (eg. pictures, documents...) there are programs that are specially designed to cure certain viruses, provided that you know the name and/or problem.
A free malware removal tool helps you identify and remove malware from your computer
malware