Hang during drag and drop

When performing a drag and drop operation from win 95 I will periodically (rather frequently) get a total hang - cold reboot necessary.  It doesnt appear to be related to any particular program that is running at the time (save for win 95 of course...:P) but it does appear to occur more frequently when there are a large number of things going on at one time (i.e. word, excel, matlab, mathcad).  Initial thought was that it was a modem/mouse com port or IRQ conflict, but I totally removed the modem from the hardware listing and to no avail.  Also with current setup it shouldnt conflict anyway.  Next thought was a bad mouse, but I borrowed a friends and that had the same problem.  I am now down to the thoughts that it is either
a.  bad serial connection to motherboard
or
b.  video problems

Any ideas?
arabianAsked:
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rlingerCommented:
add the windows 95 service pack if have not already, this fixed my problems
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