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You can download the drivers from the Compaq/HP WEBsupport/download page. Make sure you select your model laptop and the XP orVista Windows version of the drivers you require and install them. Click onthis link to download the drivers: - http://welcome.hp.com/country/au/en/cs/support.html
First make sure the wireless switch is not set to off on the laptop. Second check the device manager (start->control panel->system->hardware->device manager) and verify that the device is not disabled or in conflict and that the driver is installed (it wont have any red x's or question marks or yellow circles with black exclamation points). I think those models had a bug in the bios that made the wireless stop recognizing correctly. Try updating the bios. You can go to hp's website (support.hp.com) to download latest drivers and bios and flash utility. They also have the service manual that will tell you how to disassemble the unit to get to the wireless card if it needs to be replaced.
Probably ur system is infected by a rootkit.Search on the net for antiviruses that find out rootkits in the system. Avg 8.0 or Panda 08 can detect rootkits also.
B4 that just deactivate system restore and see whether this solves ur problem.
I had this problem once and this was due to rootkits, but i hav seen sum systems where its due to system restore.