Linux is not a clone of Windows; it's a complete operating system with programs and utilities that let you do work that needs done. It doesn't look, feel or act the same as Windows (thankfully).
There are many, many applications available for Linux for accomplishing whatever it is you need to do; e.g., LibreOffice http://www.libreoffice.org/
is a complete, free office system that, among other things, will open and allow editing of almost all Microsoft Office files plus produce PDF files for you. Did I mention free?
You cannot install Windows programs on a Linux system (or vice-versa), they are completely incompatible and that's all there is to it. You can, however, with free software such as Wine http://www.winehq.org/
, install a Windows application (in Wine) and use it on a Linux system -- not all Windows applications, but quite a few. Additionally, you can install free virtual machine software, such as VirtualBox, and then install Window in a virtual machine and simply start it when needed then shut it down when not -- the virtual machine runs in Linux only when you need it.
Perhaps if you would list the sort of applications you're looking for we could point you in the right direction?
Hope this helps some.