Q: IS there anpossible ways to retreive a file after it was erased and emptied trash bin?, IS there anpossible ways to retreive a file after it was erased and emptied trash bin?

Yes, try a data recovery software such as Data Rescue. You can download a demo to see whether it will recover the file before you buy.

It won't work if you have "Empty trash securely" turned on in Finder's preferences, though - that overwrites deleted files with zeroes.

Matt

Buy a disk drive. Use TimeMachine. Put a 2nd partition that you use to clone your system.

Have 2-3 sets of your files: active working files, backup #1 and backup #2

Mac OS X Help

http://www.apple.com/support/macbasics/

Isolating Issues in Mac OS

http://support.apple.com/kb/TS1388

https://www.apple.com/support/osx/

https://www.apple.com/support/quickassist/

http://www.apple.com/support/mac101/help/

http://www.apple.com/support/mac101/tour/

Get Help with your Product

http://docs.info.apple.com/article.html?artnum=304725

Mac OS Printing/Fax (any version), OS X Lion, OS X Mountain Lion

http://www.apple.com/support/osx/

printing in OS X Mountain Lion

http://support.apple.com/kb/HT4670

TimeMachine 101

https://support.apple.com/kb/HT1427

Mac OS X & Mountain Lion Community

https://discussions.apple.com/community/mac_os

https://discussions.apple.com/community/mac_os/os_x_mountain_lion?view=discussio ns

Recovery Mode

http://support.apple.com/kb/HT4718

ExpressLane

https://expresslane.apple.com/

Direct you to the proper forum for MacBook :