this command however depend on where and what folder you used, the "C" in this case refers to the letter of your hard drive
the "XP" refer to the name of the folder you use which contains your sub-folders(cd-root, xp-sp1- xp-boot)
check your drive letters, folders and sub folders for the correct path of the command.
just manually extract your sp1, right click on the sp1, extract all and create a new folder name it to xp-sp1 and extrat it there.
good luck. it's just a command to extract your sp1.
I followed the directions in the Tacktech site, and got the error with the command. But after several attempts I decided to unpak the SP1 into XP-SP1 folder and then run the last command. It worked. Good luck. Just copy and paste in the run. I also used the latest version of Nero to make a bootable CD with the integrated version. Don't forget to make the three folders he is refering to.
this will work 100%.
Hipster Doofus, just a suggestion.
if i were you, instead of trying to run that command just manually extract the xpsp1(right click the sp1.exe> extract )to a folder named "XP-SP1" which is a sub-folder of "XP" located at drive "X" (X being your whatever drive letter). hope this helps.