Hey Mikkel,
If you have tried running the install for the printer, then there is a temp file folder that contains this same L3.bat file.
Run disk cleanup on your computer
2. Download and run the software and drivers below.
3. Once the download is done extracting, cancel the download.
4.. Press the Windows key + R on the keyboard to bring up the run menu.
5. Type %temp% in the run field and click OK.
6. Look for, and open the folder starting with 7z (Example: 7zS2356)
7. Open folder Util
8. Open folder CCC
9. Run the uninstall_ L4.bat for non-HP computers. For HP computers run the Uninstall_L3.bat
10. When the uninstall has completed restart the computer
11. Run Disk cleanup from Accessories\ System Tools
12. Download and install the latest version of Adobe flash player
http://www.adobe.com/support/flashplayer/downloads.html
13. Use this tool to clean the system and registry. Note: This utility is not HP sponsored or approved. HP and I are not responsible for damages or loss of data caused by the utility. This step is optional. You can skip it if you want.
14. Download the full feature software and drivers
15. Run the download to reinstall the printer
Let me know how it goes,
Jason