It depends on what you're trying to transfer. If it's an application, open the content you want to transfer, then create a backup using the Export or File > Save As functions available for most of the applications. Install the new application on the PC and use the IMPORT function to add the data back. You can use a flash driver to transfer the necessary data. This applies to almost all applications available.
If you're talking about the OS, then it needs to be re-installed from scratch if you have a new computer with different hardware systems.