upper - lower filters fix

[tangomouse]

been thinking of writing a fix tool for upper/lower filters for missing cd/dvd drives ,but from what i have researched so far it would be pointless unless it fixed other devices. so my question is does anyone know of any other faults caused by upper/lower filters?

[Raymond]

Printer, Scanner and Imaging devices.
http://www.raymond.cc/blog/archives/2008/04/28/how-to-fix-unable-to-install-scanner-or-imaging-devices-due-to-registry-incomplete-or-damage-code-19/