You may need not completely reinstall your operating system. This dodgy software I believe, is generally referred to a ransom-ware (It holds your computer "ransom" geddit?) I have experienced it before on a few occasions. The most recent (and most tedious) was, from memory, call Antivirus System Pro.
What is the name of it, I could Google search some information for you on it, because if it is anything like the ransom-ware I had it will redirect all your Google searches to porn.
If we know where it's hiding on your system you should just be able to start-up in safe mode and easily delete it.
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