We know if the date/time is too far off, as well as motherboard drivers are not well, this happens.
There's also an issue with XP, Norton and more but with so little to go on, tell more.
I Have a custom built pc, and it was slowing down so i restored it, but after restoring it my LB-Link 150mbps wireless adapter will not work after installing drivers. when i first plugged it in it said installing then failed, so i then put the disc in and it finished installing. i look in device management and there is a yellow triangle beside it.
Windows being used is home premium 64bit
adapter being used is http://www.lefen.com/index.php/Product/views/id/321