Can't access/chnage some of the Registry

[Biljol]

I have tried to make 2 registry edits

1. HKLM\software\oem\bluetooth\phonevol

this one resets after a soft reset (possabul bluetooth volume fix)

2. HKLM\system\glyphcache\limit

access denided when trying to change

This an alltel unit and all other registry setting have worked.

Any ideas

Biljol