How I can transfer my music files to my Lumia windows 7

You need to have the appropriate software and the Zune PC app installed on your PC.  You may need to restart your computer, and you may need to install additional software.
Depending on what you need to install, and how much data you are transferring, this may take a while.
Some music files can be protected by digital rights management (DRM). These songs do not appear in your Zune music collection and you can't sync them on your Lumia.

How to give your phone a unique name

Here’s how to do it: Plug your phone in to your computer, and open up either the Windows Phone app or the Windows Phone app for desktop (depending on what you’re trying to sync). In the Windows Phone app, go to Settings > Preferences. Under Name your phone, type the name you’ve chosen. In the Windows Phone app for desktop, just click Settings to get started.

If you want to go old school, you can also change your phone’s name in the Windows File Explorer. Plug your phone in to your computer, and open File Explorer. Look for your phone under Computer, and then right-click on it. Click Rename, and type in the name you’ve chosen.

How can I improve my battery life on my Nokia phone?

• Turn Bluetooth off when you do not need it.
• Specify that your Nokia phone does not scan, or scans less often, for available Wireless LAN (WLAN) networks in the background when you do not need WLAN connections (to turn off scanning, disable Show WLAN availability in Wireless LAN settings). 
• If you have set Packet data connection to When available in connection settings, and there is no packet data coverage (GPRS), your Nokia phone periodically tries to establish a packet data connection. To prolong the operating time of your Nokia phone, select Packet data connection > When needed.
• The Maps application downloads new map information when you scroll to new areas on the map, which increases the demand on battery power. Prevent the automatic download of new maps.
• If the signal strength of the cellular network varies much in your area, your Nokia phone must scan for the available network repeatedly. This increases the demand on battery power.  If the Network mode is set to dual mode in the network settings, the Nokia phone searches for the UMTS network. To use only the GSM network, select Network mode > GSM. 
• The back light of the display increases the demand on battery power. In the display settings, you can change the time-out after which the back light is switched off, and adjust the light sensor that observes lighting conditions and adjusts the display brightness.
• Leaving applications running in the background increases the demand on battery power. Close the applications you are not using.
• Turn off vibrate function of your Nokia phone, using just the ring tone.
• Avoid using moving or animated pictures or videos for your Nokia phone's background.
• Turn off your Nokia phone whenever you do not plan to answer any calls, for example while you are sleeping.
• Make sure your phone is running the latest software. For downloads and assistance, go to your local Nokia website's support page.

If the battery loses the power fast even though there is no features consuming the power, the battery may be wearing out and you need to replace it with a new one.

How I can resize the tiles size on the home screen of Nokia lumia phones to a different size?

Now  you can easily re size the tile size of home screen on windows phone 7.8 and 8 .Just click on the tile and hold it for a second or two and then click on the arrow icon. Depending on the app, the tile can be of two or three different sizes. When you are ready, click the screen. You also readjust tiles. Click and hold a tile, drag and drop it to the new location, and click the screen

MY APPS OR GAMES DOING PROBLEM ON MY WINDOWS PHONE

If Games or Apps creating problem on your Windows Phone. Then takes mentioned below steps.

1.    Firstly verify your App or Game requirements. You can check the details screen to tap on the Marketplace or Store. This details screen will show you all the requirements like supported languages, web browser, location services, media library etc.

2.    After that restart your phone by press and hold the power button until you see Slide Down To Power Off ,then tap it down, then press again the power button to turn on the phone.

3.    After its check the Updates to tap on the Start & then on Marketplace.

4.    If the problem is still here then reinstall your game or app. For uninstall your app or the Game tap on Start, click on app list .then hold the app, and then tap on Uninstall.

5.    To uninstall the Games. Click on the collection of Games, tap and hold and then tap remove.

6.    To get the new copy of app or the game just tap on Start and then Marketplace. When you click Buy, a message in the purchase Confirmation Screen will let you know that you have already Purchased this App or Game and that you have the option the Install again.