Hi, Hui Ma,
Thanks for your following.
It was a disaster caused by router/browser hijack. It is nothing to do with Freescale. You can remove the thread or mark it as off-topic.
Anyway I can share my experience here.
When I tried to download Freescale v4.1.1 installer.exe,my browser downloaded a file called hKAV....exe, a malware faking KingSoft Anti-virus installer. I uninstalled it and doubted if I clicked a wrong link, actually I didn't.
Then I downloaded Freescale USB installer again. This time it downloaded the desired file. After that, I found PC worked in a wrong way. The start up menu always showed "New program installed", and most of the programs were marked and highlighted as newly installed. And most importantly, EWARM, Keil, GNU always think source files are newer than objects files. Even manually removing objects files, they were generated again. So they built and built, refused to download and debug. F***!
I double checked and tried to download any executives from other sites. The browser always downloaded the malware, and then the correct ones. So either router or browser were hijacked.
By scanning my PC with multiple Anti-virus tools for serveral days, because there are too many files I can not give up. Before I giving up and try to reinstall everything, I finally removed it.
The most helpful tool is COMODO security disk.