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In winpic says that could not initialize programmer. what should i do?

Info: Loading definitions for "PIC18F2550" from C:\Arquivos de programas\WinPic\devices.ini .
Info: Support for some newer PIC18F devices added by Martin v.d. Werff 2005
Couldn't find "devices\PIC18F2550.dev", please borrow/copy from MPLAB !
PIC18F: family='21'=4550, WriteLatch=32 bytes, EraseLatch=64 bytes .
Failed read back of DATA line (LOW) !
WARNING: Could not initialize programmer !
Testing: delay(500ms) took 0.50 seconds, timer_freq=3.5795 MHz ... ok
Info: Loading definitions for "PIC18F2550" from C:\Arquivos de programas\WinPic\devices.ini .
Info: Support for some newer PIC18F devices added by Martin v.d. Werff 2005
Couldn't find "devices\PIC18F2550.dev", please borrow/copy from MPLAB !
PIC18F: family='21'=4550, WriteLatch=32 bytes, EraseLatch=64 bytes .
Failed read back of DATA line (LOW) !
WARNING: Could not initialize programmer !
Failed read back of DATA line (LOW) !
WARNING: Could not initialize programmer !
Failed read back of DATA line (LOW) !
WARNING: Could not initialize programmer !
Programming...
Erasing ("bulk" or "chip") ...
Programming CODE, 0x000000..0x001862
Verifying CODE, 0x000000..0x001862
Verifying 0x000000..0x001862
Programming CONFIG, 0x300000..0x30000C
Verifying CONFIG, 0x300000..0x30000C
Verifying 0x300000..0x30000C
Verify Error: 300004: read 008000, wanted 0080FF, mask 00FFFF ==> diff=0000FF
Verify Error: 300006: read 000085, wanted 00FF85, mask 00FFFF ==> diff=00FF00
ERROR: Programming FAILED !

Was PIC18F2550 powered up from USB when you tried to program it?

Yes i connected the usb cable

Than double (triple) check your ICSP cable, correct pinouts, short circuits, and your board - again short circuits, continuity, correct resistors and capacitors values.