Windoze Open WiFi Problem

Recently, I changed my D-Link WiFi router
modem from secure to open. (What a hassle!)
Someone visited with a laptop. It could 'see'
the wireless network, but would not connect,
saying it couldn't get a certificate of some sort.

I went through my laptop settings and generally
fiddled around, trying to change the visitor's
laptop to the same settings, but couldn't solve
the problem; even assigning the same fixed IP
address details to the visitors's computer, (HP),
and gave up.

A www search hasn't been very helpful. The
user has one of those Telecom wireles USB
'dongles' for roaming Internet connection, so
I didn't want to fiddle too much, in case that
device got screwed over in some way.

Any clues on this 'certificate' thing? Or, more
importantly, how to disable the requirement in
visiting laptops and make the connection work?

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