Hi Pieter321,
I understand you're having an issue with the software for your Officejet 6500 Wireless printer. I'm sorry to hear you've been having issues but I will do my best to help you out!
There are two different methods that you can try here to remove the Officejet 6500 software from your computer. I would recommend trying them in order (meaning if the first method doesn't work attempt the second) but you can try either or.
1. You can download the software for your Officejet 6500 Wireless from HP's website and then once you have it and have extracted it, you can attempt the steps for a Level 3 Uninstall to remove everything. Then once it's removed you will already have the software downloaded to reinstall it.
2. You can use the Microsoft Fix it tool to remove the remaining Officejet software and then either download the software to reinstall or use your software CD that you have (if it has Windows 7 drivers on it).
Hope this helps, have a great day!!