Error (0xe0050401) from VPBrick driver: invalid hBrick

can somebody help me ? I've just installed RIS 2.0 and when I try to set "Lego Tower USB" parameters, I see in shooter.txt :
"RIS 2.0 Diagnostic Trouble Shooter     Date:     06/02/2006     Time:     20:34:46
Computer: DOMICILE-2OM1MW User name: Papa Processor Type: 586 (2) Windows 2000 DETERMNIE IF PROFESSIONAL OR SERVER in DIAGNOSE.CPP version 5.1 Service Pack 2 (Build 2600)
VPBrick DLL version: 1,0,0,2 Xlate DLL version: 1,0,0,1 Script DLL version: 1,0,2,9 Brick DLL version: 1,0,0,3 LASM version: 1,0,0,0 RCX2BLT version: 1,0,0,134 Ghost PbkComm32 DLL version: 0,9,0,90 Ghost PbkUsbPort DLL version: 0,3,45,145
    Diagnosing Error failed:         Error (0xe0050401) from VPBrick driver: invalid hBrick
Get Tower Type:     Get port name failed:         Error (0xe0050401) from VPBrick driver: invalid hBrick
Trouble Shooter closed     Time:     20:35:02"
Thank you to all for your help.
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