prob. w/ Parallels and XP: no wifi, sound, or access to prev programs/files

'll try to be as brief as possible: Problem 1: Friday, while attempting to run parallels, XP wouldn't boot; kept getting hung up w/ a black screen. I re-started straight into Windows (instead of running virtual through the Mac O/S), everything loaded fine. Began working in OneNote. Saturday, went to log into Parallels and received message that system 32\hal.dll was missing. Please install new file. Logged into OSX, looked at "untitled" drive (that's my Mac Boot Camp partition for windows) and file was where it should be. After several attempts to restart, finally tried using XP disc (at this point, had been a while since I had to "fix" a Windows problem, so it had not occurred to me to try safe mode or do a "last known successful configuration" launch).

Got the disc in, thought I could just have it load the driver; of course it reloaded the entire XP Professional. Problem 2: since I had this disc for an older desktop PC that I gave to my mom, I also gave her the CD and auth code. She can't find the auth code, so when I went to finish installing, I had no code to register (GREAT!). Luckily, she had a version of XP home/student (from her Dell), and I proceeded to load that.

Problem 3: the new home/student XP 1) doesn't recognize my wireless (or any internet for that matter) unless I'm running it through parallels. 2) when I start the Windows partition (Boot Camp) w/out Parallels, I get 3 choices to start now: XP Home, XP Professional (no code), and Parallels configuration which still says the system 32 file needs to be replaced.

It wasn't until after all of this that it occurred to me that I should have tried a "last known configuration" start, or a safe mode attempt. But at this point I need to get Windows to recognize my wifi w/out Parallels (we use an exam software that I can't run w/ virtual software); I need to get rid of these extra OS options at bootcamp start-up (I'm fine running just XP home if that's all I need). Luckily, my mom had an office 2007 cd w/ OneNote on it (which is where all my notes for class are). I was able to install that, then go into the Mac O/S, copy the data files for the original OneNote (last used on the now "corrupted" XP) to a thumb drive, then save on the new XP Home/Student and open. So at least I can see my notes.

At this point, any advice is well received.....