Reset window postions to default?

Hi, how would i go about resetting all the window positions to default i have messed them up 

 

The project explorer window is a separate window and the workspace is no where to be found i cant figure out anyway to get them back to normal

I just want it to look like this (attached picture) with the project explorer on the left and workspace on the right in the same window the default way

 

Any help would be appreciated thanks