Intermittent Bluetooth Device Driver Of Dell Inspiron 1720

The Bluetooth device driver keeps on turning off / on on its own. I'm using a wireless internet connection with a netgear router and it used to work fine for months. Problem started a week ago. I have Windows Vista Home Premium with SP2. Below are the items listed under the network adapters of device manager when my internet connection is fine:

1) Bluetooth Device (Personal Area Network) - (status is disabled)
2) Bluetooth Device (RFCOMM Protocol TDI)
3) Broadcom 440x 10/100 Integrated Controller
4) Cisco Systems VPN Adapter - (status is disabled)
5) Intel (R) Wireless WiFi Link 4965AGN

No signs of a conflict like a yellow exclamation mark or X.And here are the only ones listed when i lose connection:

1) Broadcom 440x 10/100 Integrated Controller
2) Cisco Systems VPN Adapter - (status is disabled)
3) Intel (R) Wireless WiFi Link 4965AGN

Here are the things I have done:

1) Reinstalled the network drivers downloaded from Dell specifically:Intel (R) Wireless WiFi Link 4965AGN Broadcom 440x 10/100 Integrated Controller2) When the first 2 items are visible, i tried to check for updated drivers by right clicking on it and hitting Update Driver software but it gave me a message that its already updated.
3) Enabled items 1 and 4 to see if it will make a difference but not.
4) Tried the TCP/IP stack repair options by going into CMD running it as Admin and typing in the lines below: netsh winsock reset catalognetsh int ipv4 reset reset.lognetsh int ipv6 reset reset.logRestarted the machine but still got the same problem.
5) Already checked the switch from the side of the laptop and its ON.