Model: HP Officejet t45 All-in-One, Version: 1.0
Operating System: Windows XP (Note: might work with other versions of this os.)
IMPORTANT: Start with Step A, and complete the steps in order.
STEP A: UNINSTALL prior Officejet software and POWER OFF your Officejet.
Click Start, click All Programs, point to HP Officejet, and then click Uninstall Software.
POWER OFF your Officejet and leave it powered off until the installation program prompts you to power it on.
Restart your computer.
STEP B: Confirm that ECP (Extended Capabilities Port) Mode is enabled.
Your computer's parallel port must be set to ECP mode, which allows greater communications capabilities through the parallel port. Perform the following steps to confirm that ECP mode is enabled:
Click Start and then click My Computer.
Under Tasks, click View System Information to display the System Properties page.
Click the Hardware tab, and then click Device Manager.
Double-click on Ports (COM & LPT). If you see "ECP Printer Port (LPT1)" listed under Ports, ECP mode is enabled and you can proceed to Step C; otherwise, click here for instructions on enabling ECP mode.
STEP C: Install the Officejet Software for Windows XP
During installation, Windows will display screens recommending that you stop installation because the Officejet software has not passed Windows Logo testing. Hewlett-Packard has tested this Officejet product with Windows XP and verified compatibility. When screens like the one shown below appear, click Continue Anyway.