Actually what I do is I have a winrar archive with an already pre-cleaned XP set of files in it. (I removed the Lang folder, all update folders and all external folders from the archive and pre-merged the driver cabs) So all thats really in there is the CD ident files and the bare I386 folder. When I compressed it I used the "Store" option for the compression ratio so all it does is basically just package the files. (386 megs packed up) Takes like 30 seconds now to uncompress, on my older machine it took like 1-1.3 minutes to uncompress. MUCH less time then actually copying the files, you just select "Extract here" and wait for a minute.