As you are probably aware PADS 2005 is not supported on Windows 7. We know of numerous problems that you will encounter (and probably have already encountered) during the installation. My recommendation is that you look into running on an XP machine, or perhaps even "XP Mode" on your Windows 7 machine. If you have a nodelocked (a.k.a "mobile compute") license attached to a USB key, refer to the following document for making the license work.
I should clarify that "XP Mode" is also not supported, but from our experiences you have a better chance of getting it to work than directly on the Windows 7 machine
I am assuming my reply answered your question. If you have any follow-up questions on this topic please post a new question.