unable to use Visual editor in posts, options disappeared

This is a recent problem that just started, I’ve looked through the forums this morning and can’t find what pertains to my issue, so here goes:

This morning while writing a post in the Visual editor, all of the functions seemed to disappear (screencap so you can see there are no options other than to add media)

https://www.beautyjunkiesunite.com/WP/wp-content/uploads/2011/05/visual-editor-problem.jpg

I run Vista and use Firefox, but when I switch to another machine–Win 7 with Firefox, the WYSIWYG editor works fine. I’ve double checked my profile to make sure that I haven’t disabled the visual editor while I’m writing, cleared the cache, etc. I’m at a loss for why this would start doing this only on my machine. Is there something I’ve done while in the dashboard to affect this? Only the HTML editor works for me at this time.

Many thanks in advance for your help!