Help Cant get rid of TitanShield!

I cannot get rid of Titan Shield, These are some of the things it is doing.Please help

-Lower righthand corner popups warning me of "spyware" on my computer and "click here to download program"

- When I open my internet browser, it redirects me from my homepage to something about windows security center, which I think is false

- Every once in a while a new browser opens up telling me to buy Titan Shield Antispyware

- Every once in a while a small window pops up telling me that there has been an error somewhere in system32, and that my computer will shutdown in 1 minute. It then counts down from 59 seconds. When it reaches 45 seconds a window comes up that says I need to scan my system for spyware, and when I "X" that out, it opens a website for that Titan Shield bullsh*t.

- When I google or yahoo Titan Shield Antispyware to get info on it, it does not give me results, it instead links straight to the Titan Shield page that urges me to buy the product

 

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