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I know that I can create seasonal dummy variables such as

genr jan=@seas(1)
genr feb=@seas(2)

and so forth...if I am working with monthly data.... how can I create a dummy variable for indicating years in which presidential elections take place? Since this is once every 4 years and jan once every 4 years is fine....how do I do it?

I tried...

genr preselecyr=@seas(48) and I get that ugly singular matrix error.

You cannot use @seas to do this, since @seas only works within 1 year periods (i.e. so the option you can enter on a monthly workfile is 12, not 48).

If you would like to do it automatically rather than just manually entering 1s at the appropriate date, something along the lines of:
That will give you a dummy variable for November 2000, November 2004, etc....