TrayApp is a program that comes along with the installation of HP printer products, such as HP Photosmart Digital Imaging software. TrayApp installs along with the Digital Imaging Monitor and drivers of the device.
TrayApp is part of the HP device monitor tools that ensure that the device is functioning properly. The TrayApp application detects missing or corrupt files or registry entries, which causes a Windows Installer window to open in an attempt to fix the problem on its own.
To resolve TrayApp pop ups, insert the installation disk for the HP product and reinstall the bundled device drivers and software.