URGENT !!! PLS HELP can't upload

i tried to upload a program code to my arduino just now, but i close the arduino software when it is still uploading.

after that i reopen the arduino software and try to upload a program code and now the problem come:
it show:
avrdude: stk500_getsync(): not in sync: resp=0x30
avrdude: stk500_disable(): protocol error, expect=0x14, resp=0x51

pls help ! urgent! before i(so stupid) close the software during the process of uploading, everything is OK! but now :’( :’(

using arduino diecimila and windows vista home premium and arduino-0011 Alpha

I have the same exact problem, after downloading the PCMAudio demo program to my Diecimila. Luckily I grabbed a Stickduino too, to fall back to, for now. Have you had any luck fixing yours?