Hello, I'm testing an evaluation of Keil C51 v7.04 and i've got this problem when i complied my source.. Build target 'CPs8252 V2.0' compiling serial.c... compiling I2C.c... compiling main.c... linking... BL51 BANKED LINKER/LOCATER V5.02 - SN: Eval Version COPYRIGHT KEIL ELEKTRONIK GmbH 1987 - 2002 ".\serial.obj", ".\I2C.obj", "main.obj" TO "TestLCD128x64" IXREF RAMSIZE(256) CODE( 0X0000-0X1FFF ) XDATA( 0X0000-0X7FFE ) *** FATAL ERROR L213: I/O ERROR ON WORK FILE: EXCEPTION 0029H: ACCESS TO FILE DENIED Target not created What am i do wrong? this code can be complied in my friend's computer. I'm use Windows ME my friend used Windows98 is this different effected? what can i do to solv this? I'm readed from any available document from keil but i can't find any thing about this. Could any one help me? Regards, Nitikorn K.