Workrave

Workrave is a free software application intended to prevent of Repetitive Strain Injury (RSI).
The program frequently alerts you to take micro-pauses, rest breaks and restricts you to your daily limit.

.NET version installed in Windows

List of all .NET versions available on your machine

Open command prompt and type the following instruction

reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP"

Last .NET 4 version

In command prompt type the command

reg query "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\NET Framework Setup\NDP\v4\full" /v version