Windows Technical Preview

Error 0xC1900101 – 0x20005 Installing / Upgrading Windows Technical Preview

Either you are installing Windows Technical Preview or upgrading Build 9841 to Build 9860, you are very likely to encounter the error:

0xC1900101 – 0x20005

http://answers.microsoft.com/en-us/windows/forum/windows_tp-windows_install/error-0xc1900101-0x20005/9fe8e32a-2462-47a8-bec6-7977a313cefe

The cause of this error is that you don’t have enough free space in System Drive/ Drive C:

To solve this, simplely allocate more disk space to Drive C: –  at lease 50G free space is needed.