make sure you have enough free hard drive space on whatever drive you have designated as the scratch drive.
make sure the memory allocated to photoshop in preferences is set to about 55%.
if none of the above works, post back with your system specs and more detail.
have my preferneces set to 81%. i have enough space, enough memory. but
it doesn't go.
ok... what about what i posted... :)
<http://www.adobeforums.com/webx/.ef4a07f/1>
You either have to physically delete (or rename) the preference files or, if using the Alt, Ctrl, and Shift method, be sure that you get a confirmation dialog.
This resets all settings in Photoshop to factory defaults.