Lightroom crashed when I Export

Question

I've tried this with Lightroom 1.41, then I uninstalled it and went to Lightroom 1.2 to get support for my Canon 40D
I use Windows XP, SP 3. (NOTE: I thought perhaps that a clean format and reinstall would fix it, but it still crashes when I try and Export a picture I've worked on)
-I *can* successfully go to File->Export with Preset. It works then.
I cannot simply press the Export button, or File->Export. LR will crash.
INTERESTING NOTE: Before I had this version of LR, I tried the beta of LR 2. It also crashed when I would try to Export. I never did try Export with preset. However, I have formatted and reinstalled since I had the beta on. I should think anything that messed up would have gotten fixed.
My question (besides what's wrong with my install of LR) is:
What exactly *is* Export with Preset? Is there a disadantage to using it as opposed to just plain Export? It's not a big deal to me either way, but I guess it is sort of a big deal since plain old Export won't work.:-)
Joe
Kalispell, MT
Canon 40D

Answer 1

Still not working. I've reformatted twice and reinstalled once. This latest time, I just put on XP and SP 3. Nothing else, then I installed Lightroom.
Still the same behavior, if I try to export, LR crashes. If I Export with previous (MISTAKE IN ORIGINAL POST, I MEANT EXPORT WITH PREVIOUS), it exports it as a jpg. I never do get the box in which I can choose to export as tiff, jpeg, etc...
My computer is a shopbuuilt machine, Intel D865 PERL motherboard, 2G RAM, 2-250G HDD's onboard sound and network interface, ATI Radeon 9600 vid card.
It's not a big huge deal, 99% of the time I'll want to export to jpeg. But I'd like to have the option.:-)
NOTE: I have a Toshiba laptop, XP MCE. LR works flawlessly on it.
Joe
Kalispell, MT