If double-clicking on the file that you downloaded doesn't automatically open up some appropriate program or wizard, then you could try one of these shareware programs:
www.rarsoft.com for winrar
www.winzip.com for winzip (oddly enough

)
I'm assuming that they're using some common form of compression, because you didn't specify anything. As long as Soltek's driver package is like every other driver package from the past decade, then it can be decompressed by either program to any temporary location, and I'm betting that there'll be a setup file, or at least instructions, included within.
--Geeyoff