Using Windows 7 x64. Firefox 3.6 works but won't open any windows. Only can see the windows in the toolbar to know that the software is working. tried reinstalls, and different loading spots in the computer, all to no avail. Have given up.

Question

I also returned computer to earlier setting, to no avail. Safe boot didn't work either.
addition problem with Mozilla is that it would often take many reloads to get a site to open.

Answer 1

I have my HP 855c/driver working on Win 7 Ultimate x64. I used the 'printui /s' procedure and 4 files described above with some minor changes.
I pulled WindowsServer2003.WindowsXP-KB914961-SP2-x64-ENU.exe down from the Microsoft website. Running the file causes the exe to unpack into a temp folder at the root drive. A 'Setup Error' message box is displayed once the file is run. I left this
message box up until I copied ntprint.inf, ntprint.cat, and sp2.cab from the temp folder.
I copied driver.cab from a Windows XP Pro disc. I also needed amd64\stdnames.gpd which was already in my Windows 7 c:\windows\system32\spool\drivers\x64\3 folder.  
I created a folder with the 5 files (ntprint.inf, ntprint.cat, sp2.cab, driver.cab, and amd64\stdnames.gpd). This is my 'Have Disc' folder. 
I followed the 'printui /s' instructions, first changing the permissions mentioned above and then installing the driver. Next I followed the instructions to add a printer from Control Panel 'Devices and Printers' - 'Add Printer', choosing to 'use an existing
driver' when installing the HP 855c.
I used a slightly different ntprint.inf, size 1570418. The readable contents of ntprint.inf is as follows. Notice the line 'CatalogFile=ntprint.cat' is not included. I tried using the 1570468 version of ntprint.inf; when I did I received an incompatibility
message (probably the same one mentioned above).
; NTPRINT.INF (for Windows Server 2003 family)
; List of supported printers, manufacturers
[Version]
Signature="$Windows NT$"
Provider=%MS%
; LayoutFile=layout.inf
ClassGUID={4D36E979-E325-11CE-BFC1-08002BE10318}
Class=Printer
DriverVer=10/01/2002,5.2.3790.4533
[ClassInstall32.NT]
AddReg=printer_class_addreg
[printer_class_addreg]
HKR,,,,%PrinterClassName%
HKR,,Icon,,"-4"
HKR,,Installer32,,"ntprint.dll,ClassInstall32"
HKR,,NoDisplayClass,,1
HKR,,EnumPropPages32,,"printui.dll,PrinterPropPageProvider"
 Good luck