From the
HP technical support website:
Microsoft® Windows® XP Professional x64 Edition Frequently Asked Questions
# What do I have to do with my 32-bit Windows applications so they will run?
Most 32-bit Windows applications just work. The application does not need to be changed and nothing needs to be configured in the OS.
Occasionally an application may complain that it runs only on Windows 95 or one of the other Windows OSs. The "Compatibility mode" of that program can be modified by opening the program Properties, select the Compatibility tab, and set the "Compatibility mode" to the requested OS. This will "fool" the application into thinking it is running on one of the other OSs. Note this does not always work, see below.
# What are some common Windows 32-bit application compatibility issues?
Some applications require a 32-bit driver. The software can install but the driver can not. For example, most anti-virus software uses a file system filter driver. On x64 all drivers, including file system filters, must be 64-bit. The 32-bit antivirus software can not install their file system filter driver and will not function. Note that 64-bit anti-virus software exists today and other vendors will have solutions later in 2005 or 2006.
Some applications may be coded to only run on a specific version of the OS. If the detected OS is not one of the allowable types the application will not execute. Sometimes adjusting the "Compatibility mode" described above will work around this. If "Compatibility mode" does not work the software vendor must provide an updated application that allows the application to run.
Many application installers include a 16-bit stub to identify the machine type and start a 32-bit install engine. The 16-bit portion of the installer will fail since none of the Windows 64-bit OSs can execute 16-bit code. Microsoft has identified this as a critical blocker to x64 adoption. To overcome this 64-bit Windows detects specific 16-bit installers and transparently instantiates an equivalent 32-bit version if one is available. Note that the 64-bit Windows Installer can seamlessly install 32-bit MSI-based applications on 64-bit Windows.
Here's a link to the HP 64-bit drivers. Since you don't specify the exact model you have, I can't give you a direct link. Insert your model in the search field and it will locate it for you.
HP 64-bit drivers