Tbird Portable crashes when links are clicked

My Tbird crashes, freezes up when, but not always but mostly, a link is clicked on. I did a register cleaning and it seemed to help for a few hours, but then the same problem returned. I did an adware and spyware search and nothing turned up. I also did virus scan and found nothing.

Sometimes it takes forever for the link to open up and Tbird will work after wards, but mostly it just freezes up on the link click.

Any suggestions would be greatly appreciated.