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In regard to using different drivers...

According to the inf files you posted -->here<-- those two drivers should both be compatible without any need for changes. Just uninstall the old driver completely if you want to try a different one. They are compatible because they use the same device path:

[COLLAPSE];

; Installation inf file for DVB-S USB adapter BDA driver

; Copyright 2009, TechniSat

[Version]

signature    = "$CHICAGO$"

Class        = Media

ClassGUID    = {4d36e96c-e325-11ce-bfc1-08002be10318}

Provider    = %DTV-DVB%

DriverVer    = 05/21/2009,1.0.5.502

CatalogFile         = UDST7000BDA.cat

CatalogFile.NTAMD64 = AMD64\UDST7000BDA.cat

CatalogFile.NTIA64  = IA64\UDST7000BDA.cat

[Manufacturer]

%MfgName% = DTV-DVB, NTAMD64, NTIA64

[DTV-DVB]

ST7000BDA.DeviceDesc%    = UDST7000BDA.Device,USB\VID_14F7&PID_0003

ST7000BDA.DeviceDesc1%    = UDST7000BDA.Device1,USB\VID_14F7&PID_0003[/COLLAPSE]

[COLLAPSE];==============================================================================

; TERRATEC H7

; BDA Driver Install Script (64 bit)

; Copyright (c) 2008-10, TERRATEC Electronic GmbH

;------------------------------------------------------------------------------       

; History:

;------------------------------------------------------------------------------   

; 21-Jan-09 MS 1st driver version 1.00.04.701

; 23-Jan-09 MS new driver v. 1.00.04.801 fix BSOD on some system while installing the HID device

; 16-Feb-08 FMB changed NEC device code for new Premium Remote Controls

; 01-Apr-09 FMB new driver v.1.00.05.201

; 06-Apr-09 FMB new driver v.1.00.05.301

; 28-Apr-09 FMB new driver v.1.00.05.501

; 30-Apr-09 FMB new driver v.1.00.05.601

; 09-Nov-09 CL support powersaving when device is free for 1min on WIN7 system

; 26-Mar-10 KJ new driver v.1.0.6.801 -Servicename fix inf

; 04-Aug-10 KJ new driver v.1.0.7.101 -Rev.3 EuP hardware support

; 10-Aug-10 KJ new driver v.1.0.7.201 -fix missing channel issue

; 25-Okt-10 KJ new driver v.1.0.7.601 -improved hardware support

;------------------------------------------------------------------------------

; Notes:

;------------------------------------------------------------------------------

;

;==============================================================================

[Version]

Signature   = "$CHICAGO$"

Class       = Media

ClassGUID   = {4d36e96c-e325-11ce-bfc1-08002be10318}

Provider    = %Provider%

DriverVer   = 10/25/2010,1.00.07.601

CatalogFile = terratec_h7_bda.cat

[SourceDisksNames]

1 = %DiskName%,,

[SourceDisksFiles]

TerraTecUsbBda.sys = 1

TerraTecUsbHid.sys = 1

[DestinationDirs]

Cinergy.CopySys   = 12                  ; driver files

Cinergy.CopyDll32 = 10,SysWow64         ; 32-bit DLLs

Cinergy.CopyDll64 = 11                  ; 64-bit DLLs

[ControlFlags]

ExcludeFromSelect = *

[Manufacturer]

%Provider% = TERRATEC, NTamd64

[TERRATEC.NTamd64]

;TERRATEC H7

%Cinergy.DeviceDesc% = Cinergy, USB\VID_14F7&PID_0003

;TERRATEC H7 (Rev.2) (with EuP support)

%Cinergy_rev2.DeviceDesc% = Cinergy, USB\VID_14F7&PID_0003[/COLLAPSE]