Failed initializing plugin QC9 Adapters

[Hafka77]

I am launching ALM 12.10 in IE11, 64bit (32bit cannot be launched on my computer) It throws following error in Initializing plugin phase on splash screen:

Failed to initialize. Please contact system administrator for help.
Description: Failed initializing plugin 'QC9 Adapters'.
Could not load file or assembly 'System.Data.dll' or one of its dependencies. is not a valid Win32 application. (Exception from HRESULT: 0x800700C1)

I turned on logging and found following messages in log:

 15:22:23:419	1360	[INFO    ]	[CLoader::DownloadFile                                           ]	Going to download [simple_bind_status]https://quality-center.ent.cginet/qcbin/custom_modules.cab?CV=CV--2129301476 to path C:\Users\HAVRLA~1\AppData\Local\Temp\TD_80\Loader\custom_modules.cab
 15:22:23:579	1360	[WARNING ]	[CLoader::DownloadFile                                           ]	Download completed with 0x800C0006
 15:22:23:579	1360	[INFO    ]	[CLoader::DownloadIniFile                                        ]	Download completed with 0x800C0006
 15:22:23:579	1360	[WARNING ]	[CLoader::DownloadIniFile                                        ]	https://quality-center.ent.cginet/qcbin/custom_modules.cab - Failed to download this file. Error code 0x800C0006

Could you help me with this please?

[Hafka77 · Accepted solution]

I actually fixed this by reinstalling .NET libraries. I am not sure, which one made it work.

EDIT:

I also heard, that .NET Cleanup Tool may be helpful when uninstalling the .NET.