Blackman Harris Window ----- Confused

[bofonomo]

I've seen the other posts but I am still unclear about this.

I have a time series of a few hundred values, which I've detrended.

I need to calculate a single sided spectral density function, using a
blackman harris window.  

I require a frequency resolution of 1/64 Hz, with a maximum of 4Hz,
resulting in a spectrum of 256 lines.

How do I go about doing this?  I've done a lot of googling on this and the
explinations on the method on doing this is still a little confusing.  Any
help whatsoever would be much appreciated.

Kind regards

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