[oopic] Why do my PC restart automaticlly, When I download program to OOPic board?

Today, I used a serial cable to connect my robot with PC.
I copied test code to OOPic Compiler V6, then, make and download, It
was successful.

After that, I powered off the robot, disconnected it with PC,
then, powered on, pressed the white button on OOPic board. After
these operations, but the robot didn't perform as I want.

It was awful that after those actions, I couldn't tranfter or download
the complied program to OOPic board again. Every time, when i try to
transfer complied code to OOPic board again, My PC will restart
automatically, I don't know why it will like this.

Do you know why I was fail to transfter the program to OOPic board
after those actions , but successful at first time. Did I do something
wrong?

Please help me! Thanks.

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