Which Windows version and which ShareAza version are you using?
I had obviously forgotten to copy system details request to this ShareAza forum section.

the current one x64 for windows 7 which is version 2.7.1.0

mfc100u.dll is a part of Shareaza.

well then why does it have a error then? if it is.

OldDeath & ryo-oh-ki are the experts for ShareAza. But a suggestion might be to make a backup of your settings, then uninstall the program. Re-download the newest version & install. Return your settings. Might also be an idea to set the ShareAza installer to 'Run as Administrator' before installing. In my experience on Windows 7, this has generally had a positive effect when installing (some apps don't run properly unless this is done.)

Another things to try might be to set the program to run in a certain compatibility mode, such as a different Windows. These suggestions 'might' have some kind of affect on the conflict you are seeing.

So where is yours Shareaza crash report?