user missing after "recovery" from mup.sys - HDD lost??

hey folks,
I got a big problem - when I interrupted my pc's checkdisk, it started to hang on mup.sys in safe reboot with command prompt. it started to restart itself during checkdisk after that, so I tried the "Backing up your current primary registry files" option from http://www.aitechsolutions.net/mupdotsysXPhang.html
I couldn't copy the "software" file (more than 36 MB - I don't know why it didn't copy). as this was optional, I gave up to try to copy it, and moved to "Restore base registry hive files from original installation" step on the same page, then "went back one month in bios", and restarted. it "saw" only the admin. I followed the steps, but got stuck at "Now open the System Volume Information folder", as I saw no System Volume Information folder (just documents & settings, windows, program files etc. under C, so I restarted, going back to the correct month under bios.
however, it still boots only to admin. I checked, and my profile folders are still present under the documents & settings folder, but in control panel/users my user name is gone. and system restore shows only the "month back stunt" of the admin, as I never used this user before. there is no other restore point, also I haven't disabled it!

Now my questions:

1-is it possible to have it all back, so to say, as it was yesterday?? how??
2-if not, can I "save/restore" my user profile, with all its settings etc., or have these "gone" when I overwrote the "software" in step "Restore base registry hive files from original installation" of "http://www.aitechsolutions.net/winxpnoboot.html"??? Is there any way to restore/save them??


Another thing is, in this admin mode, my 1 TB D:\ disk shows as "not formatted", although it is, just as C, in ntfs format...
any way to save this?? restore it all, or at least any way to copy files (boot with some CD Live linux version, copy files from D to C, then in windows format D and move files back to D..)????

any help appreciated...

a desperate man