I'm afraid that won't work.
The $NtUninstall..... folders contain the ORIGINAL files from BEFORE the update, and are saved there in case you want to UNINSTALL an update.
If you don't plan on uninstalling these, you can delete the folders without any problem, saves quite a bit of space.
With very few exceptions, all Windows updates are yyy.EXE files.
As long as your browser stays open, you can catch these files during an online update from the weird named folders under:
Documents and Settings\[username]\Local Settings\Temporary Internet Files\Content.IE5\6DDWFW3 or whatever they are called.
Check all these folders after an update, BEFORE you close the browser/restart the PC, and copy all *.EXE files somewhere else.
They normally hold the update-names like KB844665 or Q667553 in their titles.
If you have more than 1 PC, copy these files to the other one(s) and install them there by double-clicking on them.