How to create a PFX Certificate file from PVK and SPC files.

download the latest Windows 7.1 sdk from Microsoft  and use pvk2pfx.exe
http://www.microsoft.com/downloads/en/details.aspx?FamilyID=6b6c21d2-2006-4afa-9702-529fa782d63b&displaylang=en

download the winsdk_web.exe  (498k) and when installing select Windows Native Code Development --> Tools
In dos:-

CD "C:\Program Files\Microsoft SDKs\Windows\v7.1\Bin"

pvk2pfx -pvk c:\mykey.pvk -spc c:\mykey.spc -pfx c:\mykey.pfx
you will need to enter your PVK creation password when prompted.