I did a search of your product's help pages on HP.com but didn't come up with an exact match for your error message relevant to an Apple Mac OS X. Before offering suggestions, let me make sure I understand the problem.
You have a Word document open on your Mac and you want to insert an image into the document that's on the scanner.
I'm actually not clear as to whether you successfully scanned an image in the first place. If you did scan the image, where did you store it to? Have you tried scanning the image and saving it to your computer? If you can do this successfully, try inserting the image into your Word document from the location on your computer.
If you tried to scan an image and got the error message, then there is a communication problem between your Mac and the printer. Since you can print, the cable connection must be good. If the error message is suggesting that you reinstall the drivers, you can find the instructions for how to do this at the following web page at HP.com:
Installing and Uninstalling Printer Software on your Mac
You may or may not have your original software disc that came with the printer. If you don't or if you need an updated print driver, you can download that software from the following web page, assuming you are running Mac OS X:
Mac OS X Printer Software and Driver Downloads
Occasionally, you can solve errors by installing print drivers that are more recent than those you originally installed when you first got your printer. That's the benefit of downloading the latest drivers from HP.
On the off change you are using Mac OS 9, here's the relevant software download page (the version of the Mac operating system matters):
Mac OS 9 Printer Software and Driver Downloads
If all you want to do is to insert an image into a Word document, you shouldn't need Adobe Photoshop or any other expensive software application. You aren't trying to do any fancy editing of the graphic, just insert a pre-existing image into a document.
I hope some of the above suggestions help. Post back your results and good luck.