Win 98SE Photoshop Memory Problem

This just occured as of yesterday. I have Photoshop 5.5, but it will not load. It says "There is not enough memory (RAM) to launch Phtoshop". I am running Windows 98SE, with 256 MB of RAM. I've never had a problem before. Any ideas?

See: Bill Lamp "**VERY IMPORTANT** Photoshop Problem" 8/25/03 9:34am </cgi-bin/webx?13/3>

Also, how much space is available on the OS swap partition?