Try in the first place going to the HP site and seeing if there are any updated drivers for your machine. There have been a number of examples of incompatibilty with IE7 but nearly all are related to the need to update drivers or software which has been brought out to ensure compatibility.
In addition do you have any add ins like toolbars (Google Yahoo?)If so try temporarily disabling the toolbar and try again.
To disable a toolbar open Internet Explorer 7, follow these steps:
In Windows, click the Start button.
Click All Programs.
Click System Tools and then click Internet Explorer (No add-ons).
Once you determine the toolbar causing the issue, you should uninstall the toolbar through Add or Remove Programs in Windows Control Panel and then check the toolbar’s website for an updated version. There could be a link back to your problem.