Visual Studio 2015安装失败

Visual Studio 2015一直安装失败。
镜像哈希值是正确的，一直因为Team Explorer这个必须组件安装失败无法继续安装。
我查看了安装日志，发现了一段奇怪的错误信息：
[27C0:2598][2016-10-09T10:27:38]i000: MUX: Free Disk Space after install: SystemDrive X:\ 57651376128 bytes AppDrive x:\ 57651376128 bytes
[27C0:2598][2016-10-09T10:27:38]i000: MUX: Go to Finished page.
[27C0:2598][2016-10-09T10:27:38]i000: MUX: Watson Bucketting Parameters
[27C0:2598][2016-10-09T10:27:38]i000: MUX: P1 - vs_community
[27C0:2598][2016-10-09T10:27:38]i000: MUX: P2 - 14.0.23107.178
[27C0:2598][2016-10-09T10:27:38]i000: MUX: P3 - 14.0.23107
[27C0:2598][2016-10-09T10:27:38]i000: MUX: P4 - Install
[27C0:2598][2016-10-09T10:27:38]i000: MUX: P5 - vs_teamExplorerCore
[27C0:2598][2016-10-09T10:27:38]i000: MUX: P6 - Install
[27C0:2598][2016-10-09T10:27:38]i000: MUX: P7 - 0x80070643
[27C0:2598][2016-10-09T10:27:38]i000: MUX: P8 - You must first install Microsoft Visual Studio before installing this product.
[27C0:2598][2016-10-09T10:27:38]i000: MUX: P9 -
[27C0:2598][2016-10-09T10:27:38]i399: Apply complete, result: 0x80070643, restart: None, ba requested restart: No