Extreme VIrus on my Mac (NEED HELP)

I am having a problem with my mac. It seems that there is quite a large virus on it. It has changed my homepage in all browsers to mystart. I have went on websites to try to fix it but none of the methods work. I cannot download any anti malware scanners because this virus seems to be not allowing me to download anything. When I try to remove add-ons or change the home page, the browser just crashes and when I come back it is still there. I have tried locating file paths in finder but all the folders appear to be empty. Even my applications folder appears to be empty ! I think the virus has something to do with this. On chrome, the browser runs extremely slow and there are black squares all over my screen making chrome unusable. I cannot even get on skype because it says Can't create a lock file. If anyone knows a solution to this problem or has has this problem before I would really appreciate some guidance on how to remove this or these virus(es).

http://malwaretips.com/blogs/remove-mystart-by-incredibar-virus/
http://www.wikihow.com/Remove-Mystart.Incredibar.Com

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