It's always depressing when you install the latest OS only to find that your old reliable peripheral just isn't listed anymore. I scanned down the HP list twice and even tried the HP website (which doesn't even have a Vista one since it was on the DVD). I couldn't even get it to accept the driver off the Vista x64 install DVD.
And then a ray of hope, I found a link to the Microsoft hardware update catalog. I did a search for my laserjet 1100 and it returned results that were listed for Windows 7.
You just add the drivers you need to your basket (it's kinda like shopping but the drivers are free) and then you just view the basket and download your drivers.
One hitch, the filename was so long that winzip wasn't happy. So I just renamed the .cab file to something shorter and then I was able to extract the files. Then I just browsed to it with the "Have Disk..." option and voila. My printer works now.