Fujitsu didn't do that for you during the repair process? I'm surprised - they should have. I would have insisted on it - but I guess it's a bit late for that now.
Recontact them to see if your Lifebook (I could not find that product number on the USA site) has a Recovery Partition that can be used to either restore the system to factory conditions and/or create restore disks (and how to go about doing both processes). If that doesn't work, tell them you need to purchase a set of Recovery Disks for for computer - they should be able to sell them to you at a nominal fee. I'm not aware of anyplace to download this except through Fujitsu and they normally do not provide recovery disks in that manner - remember it needs to be specific to your machine and version of Vista so you can't just use recovery disks for other Fujitsu computers - even if the same make and model.
Another alternative is to borrow a copy of a genuine Vista Installation Disk of the same bit-size (the version doesn't matter) and use it and your original product key to re-install Vista (though any other products on the recovery disk won't be included and the Vista Disk may not have all the drivers
you need so you may need to get those from Fujitsu if you do go this route). I'm not sure where to get them as I could not find your model number anywhere on the Fujitsu USA website - but the people who repaired your machine should know if it comes to that.
I hope this helps. If you can give me anything else to ID your computer, I'll look again - but I could find nothing with what was provided. After almost an hour of research, I could find nothing about a recovery partition on these computers, so while it won't hurt to ask them, I don't think they have them. That leaves only the disks.
Here's how to contact Fujitsu USA Support if you don't already have a way having had it just diagnosed. Support & Downloads : Fujitsu United States
I hope this helps.