Sorry to hear about your dilemma mugglewump, I too waited quite awhile before trying out SP2 but after 2 weeks of hell (very slow system), I uninstalled it and reverted to SP1.
Since then, my system had an unrelated crash (fiddling with deleting TIF folders... here's the answer to that:
http://www.danish-shareware.dk/soft/emptemp/index.html try it, you'll love it!...freeware, not shareware) where my only recourse was a recovery (I couldn't even get to the prompt!) which of course set everything back to factory specs.
That was about 3 weeks ago. Since then, I have bought an external HD and Norton Ghost so I can make full, rebootable, nightly system image backups. I highly recommend this for everybody because no matter how many restore points or NTBackups you have, if you crash and can't even get to the prompt, these will not help at all. No matter, you can't use them with a prompt anyway! Also, I have attempted to make my own boot disk but you need a copy of the image file which resides on the XP install CD; of course, like most people, my system came preloaded. Luckily, when I bought Ghost, Symantec includes a recovery disk with plenty of boot.ini options.
As a side note: can someone tell me if the XP D:\ partition (used for system recoveries but anything else?) & C:\I386 folder are needed since I have a full backup image at my disposal now. I would love to free up the HD disk space these are taking up right now. TIA.
Back to the reason I decided to post to this thread: in an effort to shove SP2 down everyone's throat, Bill & Co. have made it next to impossible to find a copy of SP1 to download (unless I was just having a bad day). I finally found a copy (xpsp1a_en_x86) but it is supposed to be for multiple boxes only. Needless to say, I haven't used it yet (thanks to my saved image) but I keep it just in case since it was so hard to find in the first place.
Since your first HD came with SP1 (or earlier) originally, I suggest you do a system recovery via F8 during bootup since this should get you back to factory specs. Be warned though, I took me several tries to get it to get past the 2nd or 3rd screen, KEEP TRYING by rebooting into recovery everytime, it fnally went thru (WOW, that was scarey) and now I love my system more than ever before since it gave me a chance to do a full system cleanup and delete things I never used anyway.
G/L.