[Windows Mobile Apps and Games] destr0:
this cab shouldn't interfere with the gps, but here you have a brief of what it does:

Creates and sets the following registry values:

R.K. ID	Key	Value	Type

001	HKLM\Comm\RTC\AdapterTypes\1	00020001	REG_DWORD

002	HKLM\Comm\RTC\AdapterTypes\2	00020002	REG_DWORD

003	HKLM\Security\Phone\VoIP\VoIPPhoneCanvasIsAvailable	00000001	REG_DWORD

004	HKLM\Security\Phone\VoIP\HandsetModeMaxVolume	0000CCCC	REG_DWORD

005	HKLM\Security\Phone\VoIP\SpeakerModeMaxVolume	0000FFFF	REG_DWORD

006	HKCU\Software\Microsoft\Vmail\VMailFlags	00000004	REG_DWORD

007	HKLM\System\State\VoIP\Phone\Network Preferences	00000000	REG_DWORD

008	HKCR\VoIP\CLSID	{3BBDAFA4-5F80-4382-8543-715801B701E1}	REG_SZ

009	HKCR\CLSID\{3BBDAFA4-5F80-4382-8543-715801B701E1}\InprocServer32	voipphonecanvas.dll	REG_SZ

010	HKLM\Security\Provisioning\CSPs\.\Vendor\MSFT\VoIP	{DAB192CE-B659-460c-AE27-0F32ECB471D4}	REG_SZ

011	HKLM\System\VoIP\SIP\RtcInitFlags	00000000	REG_DWORD

012	HKLM\System\VoIP\SIP\OutgoingFailOn302	00000000	REG_DWORD

013	HKLM\System\VoIP\SIP\EnablePort5060	00000000	REG_DWORD

014	HKCU\ControlPanel\Sounds\RingTone2\Script	apw3r	REG_SZ

015	HKCU\ControlPanel\Sounds\RingTone2\Category	Ring	REG_SZ

016	HKCU\ControlPanel\Sounds\DialingVoIP\Sound	dpadctl.mid	REG_SZ

017	HKCU\ControlPanel\Sounds\DialingVoIP\Script	p	REG_SZ

018	HKCU\ControlPanel\Sounds\DialingVoIP\Category	InCallFeedback	REG_SZ

019	HKCU\ControlPanel\Sounds\TransferComplete\Sound	dpadctl.mid	REG_SZ

020	HKCU\ControlPanel\Sounds\TransferComplete\Script	p	REG_SZ

021	HKCU\ControlPanel\Sounds\TransferComplete\Category	InCallFeedback	REG_SZ

022	HKCU\ControlPanel\Sounds\RingbackVoIP\Sound	ringback.wma	REG_SZ

023	HKCU\ControlPanel\Sounds\RingbackVoIP\Script	apw3r	REG_SZ

024	HKCU\ControlPanel\Sounds\RingbackVoIP\Category	InCall2	REG_SZ

025	HKCR\CLSID\{7a42ea29-a2b7-40c4-b091-f6f024aa89be}\InprocServer32	rtcdll.dll	REG_SZ

026	HKLM\Software\Microsoft\Today\Items\"Internet Calling"\DLL	voipphonecanvas.dll	REG_SZ

027	HKLM\Software\Microsoft\Today\Items\"Internet Calling"\Enabled	00000001	REG_DWORD

028	HKLM\Software\Microsoft\Today\Items\"Internet Calling"\Flags	00000000	REG_DWORD

029	HKLM\Software\Microsoft\Today\Items\"Internet Calling"\Options	00000000	REG_DWORD

030	HKLM\Software\Microsoft\Today\Items\"Internet Calling"\Order	00000063	REG_DWORD

031	HKLM\Software\Microsoft\Today\Items\"Internet Calling"\Selectability	00000002	REG_DWORD

032	HKLM\Software\Microsoft\Today\Items\"Internet Calling"\TabOrder	00000032	REG_DWORD

033	HKLM\Software\Microsoft\Today\Items\"Internet Calling"\Type	00000004	REG_DWORD

034	HKLM\Software\Microsoft\Today\Items\"Internet Calling"\ST_EMbedded	REG_SZ

035	HKCU\System\State\Messages\Vmail\VoIP\Unread	REG_SZ

036	HKLM\Software\HTC\VoIP	REG_SZ

Installs the following files:

\Program Files\Sip Config Tool\SipConfig.exe

\Windows\dnsapi.dll

\Windows\ipdialplan.xml

\Windows\rtcdll.dll

\Windows\voipphonecanvas.dll

\Windows\ringback.wma

And creates the shortcut \Windows\Start Menu\Sip Config Tool

You should be able to uninstall, as this flag is set to true for the cab. Anyway, a manual uninstall could be possible by deleting the files it installs which I put above.

To make so, you need to disable the today plugin, and rename the files (the ones that are blocked). Then reset the device, and finally delete the renamed files. I don't think it's a registry problem