I have 2 ways to help you.
Here 's the first way:
1st - Go to your Battlefield Play4Free folder...
2nd - Go to the folder PB
3rd - Find the last applicantion in this folder, the applicantion is called ''pbsvc_p4f''
4th - Run it... and there you go!
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Second Way is
1st - Go to the game and play in a leetserver...
If the second dosen't work try the first because it's 90% of chance to work!
Hope i helped you!
Good try!
Byeee