When it comes to drivers, Windows Vista is still pretty new. Depending on your system, you may have minimal functionality. That's a big part of the reason my company never moved over to Vista...our next step will be Linux... Also, a lot of laptops come with proprietary versions of the operating system (be it Windows XP or Vista). Basically, that means the manufacturer "tweaked" the operating system to work the way it needs to with the machine. Sometimes, upgrading the operating system on a laptop can do more harm than help. Other times, it works just fine.
I think that you should read Panasonic's Web site. The best information should come from the manufacturer. I do know that you have a CF-51 but I don't know exactly which one so it's best you navigate through the site and select your exact
model. You will find that Panasonic does not
recommend operating Vista on these PCs. They also do not guarantee the operation of Windows Vista on Panasonic brand computer nor is Vista intended as user support for operating system compatibility (their exact words).
They do have some drivers available that will help fix certain issues that they have found while evaluating Vista on different Panasonic brand machines. If you search this site correctly you will find a wealth of information. It may turn out that you find what you need to get Vista working or, you may find that Vista is not the best operating system for your machine. Whatever the case, make sure you do what's best for the laptop ;)
Follow this link to find more support information and drivers for users running Vista on Panasonic brand machines http://pc-dl.panasonic.co.jp/cgi-bin/itn/toughbook/dl01.cgi
When you come to the Download Center page, you will need to choose a category (choose Driver). Next, Select your model in the list (you will see there are a lot of different CF-51 models).
Choose your operating system (here, your only option is Windows Vista Upgrade and I'll tell you why shortly).
Choose language then click Search.
The only option for Vista is upgrade...they are providing this information/software for users prior to upgrading from XP to Vista. In cases like these (when the operating system is fairly new) it's best to do your homework first. You may find that there were some fine tuning adjustments that should have been made prior to installing Vista. Your best bet may even be to roll back to XP, install any recommended software/Hot Fixes before upgrading the install Vista.
Just wanted to give you a few thoughts to start rolling around and working with. Make sure you check that Web site and be sure to click the links in the box labeled File Description. There you will find a detailed explanation of how they expect Vista to work on these PCs and what the software will fix.
Hope this helps!