See if this guidance and procedure written by John Wilkinson in the Browsers forum helps;
http://forums.cnet.com/5208-6620_102-0.html?forumID=14&threadID=247371&messageID=2484636#2484636
Mark
while starting firefox iam getting an error message stating
"microsoft visual c++ runtime library error,abnormal programme
termination" and firefox failed to start.what should i do to
solve this issue.please help.now iam using opera instead of
firefox as my browser.

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