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I would suggest you to uninstall and reinstall the latest drivers compatible for Windows 7.
Right now, there is only a Vista driver available, but you could try using that:
http://h20000.www2.hp.com/bizsupport/TechSupport/SoftwareIndex.jsp?lang=en&cc=us&prodNameId=62065&prodTypeId=18972&prodSeriesId=44784&swLang=8&taskId=135&swEnvOID=2093
You can also run Printer troubleshooter.
Open the Printer troubleshooter
Open the Printer troubleshooter by clicking the Start button, and then clicking Control Panel. In the search box, type troubleshooter, and then click Troubleshooting. Under Hardware and Sound, click Use a printer.
For further information, visit the below mentioned link:
http://windows.microsoft.com/en-US/windows7/Open-the-Printer-troubleshooter
Printer Issues: http://blogs.technet.com/b/markrussinovich/archive/2010/04/12/3324570.aspx
Run the Printer Fix it from: http://support.microsoft.com/gp/printing_problems?entrypoint=WHHT
You may refer the below mentioned links.
http://windows.microsoft.com/en-us/windows7/Install-a-printer
http://windows.microsoft.com/en-US/windows7/Find-and-install-printer-drivers
http://windows.microsoft.com/en-US/windows7/Change-your-default-printer
http://windows.microsoft.com/en-US/windows7/Printing-to-the-correct-printer