If you do not have your original disk or are looking for updated drivers, your best option is to download the current drivers from the HP support site. The address is support.hp.com and following the steps below will allow you to find the drivers you need.
1. When you get to the website click on the "drivers and software " icon
2. On this screen, you will have 2 options. If you have registered your product and have an account it will show these devices and you can click directly on them, like the PC showing here. If not, click on printer as in the picture.
3. Type in the model of your printer such as 2600. If there is more than one product that matches your search a dropdown menu will appear and you simply click on the device that matches yours. Or you can browse the list of popular products at the bottom of the page to see if yours is listed.
4. The next page will show a list of drivers and optional software, including current firmware that is available for your product. The drivers can be in a couple of places as circled below. If your product is supported by the HP Universal Print driver, that will be an additional option, but the sample printer I chose does not support it. Most often the first option will either be a link for HP Smart (if supported). The software-utility category is usually a full installation package designed for printing and scanning in stand-alone mode (no internet required for scanning)
Below is an example of a product that does support UPD and as you can see there are more options for installation. The site will normally show all available options that your device can utilize.
When you select on of the options, it will either provide basic install instructions or there will be a downloadable readme file that provides installation instructions. Down load the install that you wish to use and follow the instructions provided. Instructions will vary depending on installation method.