Vista - Wireless card not recognized on resume from sleep/hybernate

I am having this exact same as the thread found here Let me see if I can give more detail
My computer is HP tx1000 running Vista Business.
In the last 3 days when I put the computer in sleep mode, hibernate or even shut it down, upon reboot or awaken the Broadcom 4321AG 802.11a/b/g/draft-n Wi-Fi Adapter is not recognized by the plug and play wireless assistant. When looking at the device manager, it's not even on the list of hardware. I've fixed the problem a couple times by using system restore. this has worked in fixing the problem twice, but not worked once. the one time that it didn't work, I fixed the problem by updating the Windows Experience Index (there was some message about some hardware not being recognized).

When I checked the event log, I found this Error-
Source-PlugPlayManager
EventID-12
"The device 'Broadcom 4321AG 802.11a/b/g/draft-n Wi-Fi Adapter' (PCI\VEN_14E4&DEV_4328&SUBSYS_1366103C&Rev_03\4&236cf3b&0&0018) disappeared from the system without first being prepared for removal.

When I looked on Windows event site, it says "you can safely ignore this event" here. That doesn't make sense, because I obviously still can't get online.

suggestions???

The event is presumably another side-effect of some underlying problem - it's not the root cause.

I'd suggest you update your BIOS and the wifi NIC driver. Any time that components fail to successfully handle power state transitions, the BIOS and the relevant driver are the most likely culprits.