Realplayer out of memory error

My desktop is running with windows 2000 professional, it has 128MB physical memory. Recently, when I try to use realplayer 9 to open .rm file, it says out of memory, I checked the memory and try to have 80MB more free space,still the same problem occured,I have tried to reinstall Realplayer 8 plus and realplayer 8 basic, all the same.

How to solve it? or are there other media player can handle .rm file?