I also have the same problem like this, i upgrade the computer to windows 7 then it cannot install. I have read some blogs and all of this is not working. But in an accident while i am trying to explore with my computer trying to install the hp 1280 printer i did this procedures.
1. Get driver of the printer from CD or download from the internet the hp 1280 driver for XP or Vista.
2. Go to start menu then go to devices and printers icons.
3. Click the Add printer the see the windows update and have disk will appear.
4. Click have disc and open your source file of the hp 1280 driver then just follow the same set up in installing the printer then finished..
So simple as this....