HP 3845 is an old printer and it is possible that the Software Disk that you have might not be compatible with Win-XP.
You can install the compatible software from
www.hp.com.
Enter 3845 in the field for product and press enter..
it will give the list of all the product that are similar to 3845..
choose your product,,
on the next screen it will ask you to choose the O/S..
choose win-xp..
on the next screen select Software & Drivers..
then Full Feature Software & Driver
scroll down and click on Download Now instead of Install..
Once the download is complete..open it and run the file tinstall the software
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