never used this but may be worth a try
http://www.winundelete.com/

i have it and upgraded to the studio version. I use it constantly on any portraits. Never had a problem with it crashing or anything. using win7. If you check the photo magazines you can find a discount for 15% i believe

Try this link and see if it works www.everimaging.com

Hi i never tried HDR with cs5 but i have photomatix and HDR darkroom. Both have trial software available. I happen to like hdr darkroom best but my copy of photomatix is quite old and they have a new version. I was just too cheap to pay $99 for it I got HDR darkroom 9.95