IE7 and the recently-released IE8 are the only versions of Internet Explorer that are supported by Windows Vista. IE6 was not designed or updated for Windows Vista, is incompatible with the operating system, and checks the operating system during installation, refusing to install on any operating system not explicitly supported. The HP representative should have been aware of this.
You could try a System Restore back to the last time it worked properly, before HP's representative made whatever changes he/she did, and then re-address the printer issue. If that fails, you could also try running System File Checker to see if it is able to repair any corrupted system files that might exist.
Hope this helps,
I have a 1 1/2 year old Compaq Presario. I recently installed an HP Deskjet All-in-One F2210 printer. There was difficulty in the installation, so I called support.Can't explain what that tech did, but the PRINTER works fine. Ever since then, IE 7 began constantly crashing. I called back to support on 4/18/09 and an HP tech remotely installed Mozilla (took 3 hours in all!)Firefox, so I do have a browser. He said to uninstall IE 7 and install IE 6. IE 7 was factory installed. Should I download IE 6 SP from here, and is it compatible with Vista Home Basic? I had tried prior to this problem to update to IE8, but install would always fail with the message that IE8 was not supported by my...I forget what...computer, maybe? Any ideas what to do?