On Windows 7 Professional 64-bit, I attempt to install Vivado but it fails with either the Web Install or the single file download (SDF) install.
You need admin privileges to install Vivado 2015.1 on Windows OS.
This means you will need to do one of the following:
This issue has also been seen if a user does not have C:/Windows/System32 in their system PATH.
Specifically, net.exe needs to be found on the system in order for the installer to run.
In Vivado 2015.2, the full path to net.exe (C:/Windows/System32/net.exe) will be used to avoid this possibility.
For Vivado 2015.1, you must add C:/Windows/System32/ to your PATH variable.
Right click on xsetup.exe and run as an administrator.