I'm using Dell Inspiron 1525 laptop. Till few days ago internet was working fine on it via WIFI. Now even if I'm enabling the radio button(a small button in the right side to switch on bluetooth and Wifi) it denies to connect to wifi. On checking device management , found that Bluetooth is missing under network adaptors (which was intitally present). I tried to reboot system, switch off-switchon the radio button many times but it doesnt helps. But sometimes it automatically connects to my room wifi for few seconds and then again gets disabled with the same error -"The radio on your 802.11 network adapter is still disabled. Use the hardware radio control switch to enable it".
Also I've tried restarting Bluetooth support service couple of times , making it as 'Log on via Local user' . Also I've tried 'Scan for hardware changed' many times , but no luck.

Can someone please help me on this? is it a hardware or Software issue??

(Really stuck and helpless as how to proceed)
I'm using windows Vista,Home Basic , SP2