After a bit of troubleshooting I've narrowed the problem down, at least on my computer, Pavillion dv9417ca.
The problem is caused by Cumulative Update for Windows Media Center for Windows Vista.
When I install this update the broadcom drivers disappear.
In my last post I described the process I use to get the drivers back, now I've found a quicker way. Here are the steps:
1. Remove Cumulative Update for WMC listed above. Restart.
2. Start Recovery Manager (type Rec in Search and then click Recovery Manager to run it. Choose Advanced setting and reinstall Broadcom driver. It will ask to restart computer so restart it.
3. When computer restarts go into bios setup (F10 on my machine at startup) and Load System Defaults. Broadcom driver will NOT reinstall if you do not do this. I forgot to mention this in the last post. Then exit saving changes. Computer will restart and once windows starts your broadcom driver should load (you should see it in the system tray on startup.)
Blue light should come on with wireless working.
One thing. If your computer goes into sleep mode you will lose the drivers again, at least on my computer it does. You will have to do the process all over again. I reset sleep mode to NEVER.
I've done this process several times now and every time it works. It does not work when the Cumulative Update for WMS is installed.
Hopefully someone else can try and let us know if the same thing happens for them.
Automatic Updates is now turned off on my computer and Sleep Mode is set to never and things are working fine. Obviously though there needs to be a fix issued for this by HP or Microsoft.
Hope this helps someone.
The above is quoted from
http://h30434.www3.hp.com/psg/board/message?board.id=Internet&thread.id=1144&page=4
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