I' ve this bug, too. It usually happens after the game has been on for a while.
Remedy: Save before you enter the cantina. Quit the game, defrag jolly ol' windows, start anew, enter the cantina and wait a moment for everything to load. That's what works for me.
Another thing you might want to do is set the pagefile to a fixed value. Bioware games usually don't like more than 4 GB, which is the old windows maximum for single pagefiles.
"When the power of love overcomes the love of power, the world will know peace." - Jimi Hendrix