We are using Lansweeper v3.5.2.4 and IE8 is not reported on some systems.  We see no apparent OS pattern (Vista bus 32-bit, Win7 Pro 64-bit).  When we look at the software installed on the computer, IE is not reported!
Fyi, when I look under "Add/remove programs", it doesn't show there either.  I suspect this is a Microsoft issue but do you have a workaround to detect IE8?
Regards,
Pierre