Since you have root explorer we can make it sort of easy.
Copy both the launcher files (.apk and .odex) to a folder on your SD card. Unhook from the PC and fire up root explorer.
Long press on the .apk file youve got stored on your SD card, and select copy or move.
go to /system/app, and click the button on the top left to mount it writable. Click the paste button on the bottom of the window.
Do the same thing for the .odex file.
Go back to /system/app and click the button so it's no longer writable.