Recent "Blue Screen" problems

Hi all:

For the last couple of weeks I've been having frequent "blue screen"
problems when attempting to use my browser (Firefox). Clicking on a
link - say, in email - or attempting to open the browser directly
sometimes results in a blue screen telling me WindowsME has encountered
a problem. I can usually just hit a key and return to the desktop or
email screen, but I can't get the browser open. The error codes
displayed have been eiher "Error: 06 : 090F : 000045EB" or "Error: 06 :
0177 : 0000305A". Sometimes Outlook Express also freezes up.

The only recent downloads have been Windows Updates and a slight
improvement to Firefox.

Anybody else encountering this issue, or have an idea about what's
causing the problem?

TIA.

Tom Young