file path with username inside

Hi

I'm a new starter with AutoIt I need to launch a DirCopy with the user name inside the file path, could you please help me to find what is the correct sysntax ?
I search on google, but I can't find the right way to write the command, tryed with
DirCopy ( "W:\install\", "C:\documents and settings\"& @username &"\somedirectory\" )
but doesn't works

Thanks

Raven