BLUETOOTH DRIVER NOT GETTING INSTALLED IN WINDOWS 8

I earlier had windows 7 in which my laptop's bluetooth was working fine. Then i installed windows 8 release preview and even in that bluetooth was working fine. yesterday i installed windows 8 pro with WMC in it and since then the bluetooth isn't working.

My wifi is working fine.

1. I even checked in the BIOS....internal bluetooth is enabled.

2. I tired to install the driver by downloading it from http://www.dell.com/support/drivers/us/en/19/DriverDetails?driverId=31N70 , but it didn't work.

3. I even tried to this method

Access device manager

- Click ‘Start’, and then click ‘Control Panel’

- Click ‘Hardware and Sound’

- Click ‘Device Manager’

- ‘User Account Control’ dialog box appears.

- Click ‘Continue’

- Device Manager Page opens up.

- Locate a category called ‘Bluetooth Radios’

- If not found, locate ‘Network Adapter’

- Also observe if it has a yellow mark besides any of the device listed

- Browse through the whole list to check for any other item listed with a yellow mark

- Capture the item with the yellow mark

But there is no driver which needs upgradation

4. I even tried this method

- Click the following link to download the most updated driver for the Bluetooth: http://dell.to/OP6bkb
- Save the folder (zipped folder) on the 'Desktop screen'
- Double-click the new icon on the desktop labeled R241623.exe
- The Self-Extracting window appears and prompts you to extract or unzip to C:\DELL\DRIVERS
- Click Ok
- After completing the file extraction, if the Self-Extractor window is still open, close it
- Open the following path: C:\dell\Drivers\31N70\Win64 (Follow steps mentioned below)
- Click 'Computer' and drive letter 'C'
- Locate folder 'dell' and double click it
- Locate folder 'Drivers' and double click it
- Locate folder '31N70'
- Locate folder 'Win64' and double click it 
- Locate file Inst (Refer to the image below)
   
- Right click file 'Inst'
- Click 'Run as an administrator'
- Click 'Yes' to continue if prompted with 'User access control' message
- Follow through with the installation as per the screen instructions
- Finish the installation and check for the Bluetooth functionality
- If issue persists, try using the 'setup' file to install drivers in compatibility mode (Next Step)

Install 'Setup.exe' file in 'compatibility Mode'
- Navigate to C:\dell\Drivers\31N70\Win64
- Right click ‘Setup’ file and click ‘Properties’
- Click “Install in compatibility mode’
- Click on Application and select ‘Troubleshoot Compatibility’
- Next, click on ‘Troubleshoot Program’
- Click on Program worked in earlier versions of Windows
- Click on ‘Windows 7’
- Click on ‘Start the Program’
- Do not hit ‘Next’ until the installation completes
- Once the installation completes, click on ‘Next’

but it still didn't work...and installation ended with this dialog box

Please help....need it urgently
Thanks!! :)