Try changing this registry entry:
HLKM\Comm\Cellular\SMS\Protocol\Text\DLL
from HTC_SMS_Providers.dll
to SMS_Providers.dll
Then soft-reset
BTW, I believe this issue (if it is the same thing you are experiencing) is already being discussed here
http://www.ppcgeeks.com/helmi-offici...,90.html#66559
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