Arduino Decimila uploading problem

Hi,
Everything seem to be all right after i burned the bootloader into my arduino, but it only works once. I can upload my sektch to the board only once and the second time the following message appears in the console window
avrdude: stk500_getsync(): not in sync: resp=0x00
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51
Any suggestions would be appreciated. Thanks

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