I'm receiving the following error when installing Win2PDF:
missing file C:\Windows\system32\spool\w32x86\3\mxdwdrv.dll error 2.

Solution:

If you install the free Microsoft "XPS Essentials Pack" and then reinstall Win2PDF, it should resolve this error. You can download the "XPS Essentials Pack" from the following page:

http://www.microsoft.com/downloads/details.aspx?FamilyId=B8DCFFDD-E3A5-44CC-8021-7649FD37FFEE&displaylang=en

To reinstall the Microsoft XPS Document Writer on Windows 7:

Frst delete the "XPS Document Writer" icon from the "Printers and Faxes" section of the "Devices and Printers" folder if it exists. Next, choose "Add a printer", and select the following options:
"Add a local printer"
"Use an existing port" -> "XPSPort"
Manufacturer: "Microsoft", Printers: "Microsoft XPS Document Writer"
"Replace the current driver"
Printer name: "Microsoft XPS Document Writer"

Then reinstall Win2PDF 7