Wireless light is off.

It sounds like you do not have the driver or the support software for your WiFi adapter installed.
At the Dell Support web site, you can download the appropriate Networking drivers and support software.
Once you've done this, you should see a WiFi utility in the tray with the Bluetooth symbol.

Here you go:

http://support.us.dell.com/support/downloads/download.aspx?c=us&l=en&s=gen&releaseid=R224319&formatcnt=0&libid=0&typeid=-1&dateid=-1&formatid=-1&source=-1&fileid=320759

you will nead to install the driver or the software for the device which cam with rhe laptop

To enable/disable WLAN, please press "Fn+F11" to execute the device: (then follow below steps accordingly)
Note: there are four stages in all, assumingly both bluetooth and wifi are installed.

First stage : press Fn+F11 = Enable WLAN only
Second stage : press Fn+F11 = Bluetooth On + WLAN Off
Third stage press : Fn+F11 = Bluetooth On + WLAN On
Fourth stage press : Fn+F11 = Bluetooth Off + WLAN Off

After enabling the WLAN, search the Access Point and connect with it. Now, you may use the WLAN.

If this does not work, check if the driver is installed in your computer by going to the device manager. check under network adapters. If the driver is installed, uninstall the current driver and restart the computer.

If the issue still persists, you may download the driver update at the msi website: http://www.msi.com/index.php?func=nbdriver&maincat_no=135&prod_no=1474. Just make sure the driver you're downloading is compatible with yoru operating system

You may have installed the correct driver but does the laptop have a bluetooth component device installed? Check in control panel, system specs.

try to reboot again your laptop then if doesn't work again reinstall your driver again and make it sure you install it properly then reboot you laptop.
Thanks

boot to the BIOS (by turning your computer on the start tapping on F2) after that, on the left pane, look for wireless, (you can only navigate using the arrow keys. highlight wireless then hit Enter, after that highlight bluetooth check if its ENABLED, if it IS ENABLED, go to control Panel open the bluetooth icon, make sure that the device you are trying to hook up to the computer is on Discovery mode or the bluetooth wireless is activated, try searching for it (the device) see if it connects this time. Hit me back on the results.

The Dell QuickSet utility Wireless options can cause these issues.

There is a setting to always deactivate on battery. Make sure this is not set up. The correct setting would be Always active on battery or Always On, or no power saving options for Wi-Fi. Depending on the version of QuickSet which you have.

It is known to glitch when power is removed from the machine while the wireless is in use.

Please let us know if you have any futher questions. If this information was helpful, please take a moment to rate the solution. Thank you.

The Dell QuickSet utility Wireless options can cause these issues.

There is a setting to always deactivate on battery. Make sure this is not set up. The correct setting would be Always active on battery or Always On, or no power saving options for Wi-Fi. Depending on the version of QuickSet which you have.

It is known to glitch when power is removed from the machine while the wireless is in use.

Please let us know if you have any futher questions. If this information was helpful, please take a moment to rate the solution. Thank you.

Boot to the system BIOS and ensure that a Bluetooth card is actually installed and seen by the system. I'm pretty sure bluetooth is a option on the 1510 and you may not have a BT card.