Post a tracker item of this along with ufoconsole.log and an accurate description of your setup, including what hard drives you're using for what, where you try to install etc.
Default directory, only within the D:/
the windows cmd window opens saying
"The system cannot find the file specified.
The system cannot find the path specified.
Press any key to continue..."
and it looks like the file its trying to load is "C:\DOCUME~1\<user>\LOCALS~1\Temp\makepk3_full.cmd" "pk3.7z"
im updated my game on harddrive D:\ without any problems... which OS you using?
XP SP3
EDIT: the problem is that I was trying to do a fresh install, rather than update