Updates:
1. I tried the PC Recovery program that HP does have, which does in fact use non-destructive mode as the default -- but that did not fix the problem.
2. As for LinuxLive, I tried Mandriva One's 32-bit GNOME version, but that one wasn't able to find/use drivers for my wireless hardware, nor was it able to non-destructively install on my Windows partition. (If I recall correctly, an error message claimed 16 clusters were referenced multiple times.) By default running it off the CD resulted in it logging me automatically as a guest, with no access to the C: drive other than the above install attempt; I have yet to try the KDE (?) version or Knoppix.
Q: Would Linspire or Freespire be good alternatives in trying to access my files in the first place?
3. Went to my "local" CompUSA to inquire, where the (fortunately very helpful) employee at the Technical Services counter confirmed file corruption; unfortunately them doing the recovery/backup would be $99.99 on discs or $79.99 if I gave them a hard drive to use. He was negative though about attempting to repair with other versions of XP, and told me to check with HP first due to my specific needs.
As an interesting alternative to ordering a recovery disc ($14.95+tax) or going all the way with Vista, I found
this:
HP Notebook PCs - Upgrading to Windows Vista Using the HP Express Upgrade Kit wrote:3. If you have not already created an OS recovery disc, you will be prompted to create one before doing the upgrade. If necessary, the recovery disc can be used to re-install the original XP operating system.
4. You will be prompted to back up all user data files to external storage media. During the upgrade process, all files on the PC are deleted.
How does this sound?
"Yee's proposal is exactly the sort of thing I would expect some Washington legal eagle to do. In fact, it could even be argued it would be unrealistic to not have a scene in the next book of, say, a Congressman Yee submit the Yee Act for consideration.

" -
bcoogler on
this
"My crystal ball is filled with smoke, and my hovercraft is full of eels." -
Bayonet
Stark: "You can't even GET to heaven. You don't even know where it is, or even if it still exists."
SirNitram: "So storm Hell." -
From the legendary thread