well, let me try to clear myself: I used a Chinese software to remove IE6. I really removed it. But after that, I found all files those should be hidden by default, such as boot.ini, appeared. I tried to hided them again, so I clicked MY COMPUTER, then clicked LOCAL DISK (C, I saw those files(boot.ini, command.com, config.sys and so on), then clicked the TOOLS on the top menu, then FOLDER OPTIONS, folder options window came out, selected VIEW from the top of that window, then I saw a field named as "Advanced settings:", If everything was right, I should hided all system files by getting some setting here.

I am runing a Windows 2000 Advanced Server on my laptop (PIII 1000, 256RAM).

hopefully I made myself clear.

thanks all guys!