Firstly, phew! That makes the whole thing easier.
Just to note, if you're a bit anal about your iTunes library, then this method means you lose playcounts, star rating etc. But either way it really is the simplest means.
Actually on windows (I'm Mac so slightly different) i think you can give it a go without any additional software. The only problem here is you'd have to start with a clear library first and then import songs. This isn't as major a gamble as it I'm painting out, it's just that if it goes wrong (see next comment) you'll lose iPod data and be back at square one with the duplicates. In short though, this means you don't have to download any software and run the pesky risk of viruses and spyware etc. You'll have to delete the old library on your laptop first or just create a new one. Search in iTunes help for creating a new library, it's pretty simple stuff.
The only problem here is if your iPod is set to sync automatically when plugged in. When you connect the ipod do you have to import songs to it manually or does it just do it itself. If it's the latter then you'll need to have your finger poised for some quick fire button bashing. Note: if this doesn't work you run the risk of the iPod syncing to a blank library and losing all data:
- Connect the iPod to your laptop.
- If iTunes starts syncing hit the X in the upper right hand corner of iTunes display, to the left of the search box, to stop it (i.e. close the dialogue box). Hopefully if you're quick enough it'll work.
- In Control Panel, Portable Media Devices, double-click your iPod.
- In the Tools menu -> Options, in the View Tab, check "Show hidden files and folders."
- Navigate to the Music folder might be something like this Portable Media Devices\"your" IPOD (F: or E
\iPod_Control\Music
- Select all the music folders, and drag and drop them into a folder on your hard drive, or directly into iTunes.
The other way with a few more steps is to copy/back-up to your external drive, then delete the itunes library, set up a new one and import the ipod back up.
Loads of software available for free:
http://www.ipod-computer.net/?gclid=CK-MhKO_p5oCFdxM5QodRyLx1Q
They're generally good products, but only have a free demo period. This may be limited and so you might not be able to do full back-up.
freeware here:
http://www.findmysoft.com/software/ipod_backup/
I've never used any of those products, as different ones for Mac. But they generally work the same way. PodUtil or PodWorks generally seem to be the most popular.
You'll have to make sure that the ipod settings are correct, but be careful. Follow the instructions regarding the automatic sync, if it is set to that rather than manual, close it out before it starts to copy the library as it will copy the duplicates. Your iPod needs to be enabled as an external drive (enable disk use).