I am not entirely sure what is exactly your problem, but assuming your browser is working on it's own, I'd tell you to either provide more information or (preferrably, and) use ADWCleaner, which helps in most cases with "browser malwaring".
I'd also tell you to try the oficial site, but I think last time I did, it came packed with some crappy installer. Should that be the case, try this old version of me [link to unofficial source removed]