Remote controlled power sockets

Hi
Sorry to be a pain.
I have tried rcswitch.h and cpp files everywhere but still get this error messsage. - ReceiveDemo_Simple.cpp:7:22: error: RCSwitch.h: No such file or directory
ReceiveDemo_Simple.pde:-1: error: 'RCSwitch' does not name a type
ReceiveDemo_Simple.cpp: In function 'void setup()':
ReceiveDemo_Simple.pde:-1: error: 'mySwitch' was not declared in this scope
ReceiveDemo_Simple.cpp: In function 'void loop()':
ReceiveDemo_Simple.pde:-1: error: 'mySwitch' was not declared in this scope

Arduino v1
I'm only trying the simple example. Shoiuld the path etc be in the actual code?

No rush and thanks for your patience