default browser keeps changing.

I have VM Fusion with an XP session. When I'm in MAC and try to open a hyperlink it uses the browser in my XP session. I use Safari on the MAC side and have gone into the preferences and changed the default browser to Safari, but after a reboot it goes back to using the XP browser. It does show the Xp browser as the default in the preference setting in Safari. I can change it and it will work until I reboot. Any thought?

 

thanks...I'll check that out.!