well, you have many choises here.
one is to upgrade those clients to something never than ... well.
another might be that you keep up looking what the problem is.
in the latter version you are gonna shed some tears, so watch out.
if you go on this path, you might want to start looking at the IE version on the computers.
another thing to check is what version is labeled on c:\windows\system\shell32.dll
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!download
KiXnet
