2009-06-28 01:43:28 UTC
I have answered these questions myself with testing. Here is what I found:
1. Do I need to swap drive letters on my only operating system to boot successfully?
Yes, that was what I needed to make GAG work in this configuration.
2. Is there a risk in doing so?
No. Apparently,swapping drive letters is done in RAM and does not survive the next boot.
3. How can I restore the drive letters if I can't boot Widows XP at all?
No need to. See the second part of the answer to the second question.