Try this: UFDisk Utility 184.108.40.206 http://mfiles.naver....ies_220.127.116.11.exe
Works great with Lexar flashdrives and they don't have to be U3 , others I'm not so sure. Has provision to load iso file and to boot it as cdrom.
With this your PC will see it as cdrom drive.
I'm trying this with an SMI USB stick. It's detected ok, and adding an ISO through the AutoRun menu seems successful, but the stick still isn't working as a CD. Is there anything else I need to do?