pscript driver is included in 7 and 8.
You just have to modify an .inf and .ppd file for your needs (easy job).
Then you will install with the "have disk" option.
**broken link removed**
Winsteng no longer supported, you may have issues with it.
If you just want a pdf printer, you can add a free program like pdfcreator.
But be aware of the addons that YOU HAVE to disable during installation or you may get also an adware browser hijacker (like delta search etc)