Hi Kathy,
You might like to refer to post 10.1.1 above (you might have to hit View All on this thread - it's gotten pretty long now, and the system only shows you messages in stages).
If her software was first installed on your Pod, and you had trouble, what kind of problems did you encounter? Was it the sysinfo message - or something more serious?
As I'm sure you're aware, a Restore will completely wipe iPod.
Briefly:
You'll need to connect your iPod to her computer. Be aware that her iTunes is likely to launch when this is done, and if you have autoupdate enabled, her music library will be copied to your iPod. But this is of little consequence, because you're about to wipe it all anyway.
Launch the relevant iPod Updater (Start, All Programs, iPod, iPod Updater - choosing the right one for 3.0.1 firmware). Select Restore and follow the instructions, making sure you connect iPod to the external power source to complete the operation when prompted.
Check it's been done correctly by going into Settings, About in iPod, and check firmware version as 3.0.1.
Then reconnect your iPod and synchronise your music as you'd normally do...
Easy as pie. In theory. Let us know how you get on...!
Good luck,
Da Gopha.