Before i had some problems with directx, on the internet the solution wich had the most positive feedback was to uninstall windows update KB971512. Now windows update is stuck on installing KB971644. with code 8000FFFF. Eventviewer says : The Windows update could not be installed because of an error: 2147942487 "The parameter is incorrect." (Command line: ""C:\Windows\System32\wusa.exe" ") about the KB971644 update and The Windows update "Update for Windows (KB971512)" could not be installed because of an error: 2147549183 "Catastrophic failure" (Command line: ""C:\Windows\system32\wusa.exe" "C:\Windows6.0-KB971512-x64(1).msu" ") about reinstalling the KB971512 update manually System Information ------------------ Time of this report: 7/12/2012, 15:39:01 Machine name: F Operating System: Windows Vista Ultimate (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.120402-0336) Language: Dutch (Regional Setting: Dutch) System Manufacturer: alienware System Model: Area-51 7500 R6 BIOS: Phoenix - AwardBIOS v6.00PG Processor: Intel(R) Core(TM)2 Quad CPU Q9550 @ 2.83GHz (4 CPUs), ~2.8GHz Memory: 8190MB RAM Page File: 2798MB used, 13802MB available Windows Dir: C:\Windows DirectX Version: DirectX 10 DX Setup Parameters: Not found DxDiag Version: 6.00.6001.18000 32bit Unicode Display Devices --------------- Card name: AMD Radeon HD 6900 Series Allready tried the microsoft solution to error 8000FFFF no joy. I hope someone here can help me Regards Raoul