unset system attribute changed by virus

Some kind of viruses turn your data files and folders into system objects so that it cannot be read, modified or deleted.
This cannot be undone in Windows simply by uncheck the properties READ-ONLY and HIDDEN. In fact, as a file is treated as a system file, the attribute HIDDEN is even disabled to keep the computer safe.
So, DOS (or command prompt) can solve this problem. The command to type is:

attrib -s -h -r [path\]

Hey, so that's what is called "command-line power". Hehehe...

---------- UPDATED May 17th 2009 -----------
The command line seemed laborious since I had NexusFile installed on my machine. All I need to do is click and delete. No fake system file can get through the this file explorer.
Worth to try, that's just part of the cookies.

^_^