infrared icon did not show although all services started

hi,

The infrared icon did not show in task bar as usual when i
try send data to my notebook from handheld device after i
did some DIY setting in registry and services (like turn
off some services and modified registry value), and the
stupid thing was that I did not do the backup before DIY.

I tried turn on all services, but the infrared still
cannot work although my handheld can send data to other
notebooks.

Anybody have ideas about what kind of setting in registry
and services or anything else will affect the infrared
work?

Regards,
Jinn