gs(or in your case gswin32) -dNOPAUSE -dBATCH -sDEVICE=pdfwrite -r600
-dCompatibilityLevel=1.4 -sOutputFile=whatever.pdf filename.ps
Will generate a PDF from the PS.
I prefer command line operation to GSView for anything other than just displaying.
You can generate PS from PDF, split pages out of PDFs, generate bitmaps and all sorts. Take a look at the options in the "File-Convert" menu of GSView.
I once added a bookmark tree and links to a PDF copy of the NASA Apollo 13 Cortwright Report by splitting the PDF into individual PS pages, manually adding pdfmarks with a text editor, then re-distilling the PS pages into a single PDF. The original was scanned typescript, hence bitmaps, so it was, and is, huge. All done with ghostscript. No Acrobat distiller here.
RTFM (HTML bundled with the ghostscript package) There are so many options, versatility is tremendous. It's a bit of a learning curve.
Don't expect a binary distribution to have been compiled with all the optional devices and drivers. The one I use was compiled on this system, with the drivers that *I* wanted. It forms the core of the print system.