Dreamweaver error message

I really hope someone can help me.
When I open my dreamweaver CS3 or CS4 (the same thing happens), I get an error message “an invalid argument was encountered” twice. I click ok and try to select new HTML page and I lose some options I normally have while creating and editing a HTML page.
Furthermore, when I try to save HTML or any other type of webpage, the program crashes and I get some warning that goes like this: “Runtime error:
C:…”
Thanks
Answer #1
get “Hard Disk Sentinel” and check your drive for errors
also check your error log in event viewer for any clues
Answer #2
thank you, you have been very helpful.
But my problem is not solved
Answer #3
What is the runtime error you are experiencing?
Also check the windows event viewer and let us know what you are seeing.
Answer #4
R6025
pure virtual function call
Answer #5
DW was working Ok before this
have you installed anything lately ?