mafiii,
Unless the new system has the identical BIOS to the old system and the Windows is OEM, you will need to install and activate Windows on the new system. Even when the systems are the same make and model, Windows will not run as well when simply plugged in. By all means possible, keep the preinstalled Windows on the new system.
]1.[/b] The C: drive in the new system will attached to SATA 0. Complete in every detail the C: drive in the new system loading all programs and accessory programs including browsers, antivirus and etc. Use the disk clean option in Win Explorer /Properties between to remove installation files and logs. If it's not an SSD, defragment / consolidate the C: drive between every large program install until complete.
2. On the original system, use the opportunity to review the file structure, folder names, and remove useless of obsolete files and/or create Archive folders separate from the active ones. Defragment (if not SSD) .
3. To transfer your files, simply plug the source drive to SATA 1 in the new system and use Windows Explorer to copy every folder to the new drive. When the computer is started, it will run on the new OS as that drive (on SATA 0) is listed in the boot sequence.
4. Check for possible duplication and the integrity of the files. Open the latest file from each program you use and see if it runs it properly. This will help organize the workspace settings on the new system as well.
5. Keep the original files on the old drive as long as possible, until you're absolutely sure you have everything and they work. When you're certain, format the old drive, allocate the space and create any partitions you might want and that space is available for use. A very useful utility for these operation is the free version of EaseUs Partition Master.
Option: Consider creating a partition for the OS/programs- giving it plenty of expansion space- and another or others for the files. For example, on one of my the current systems, the main OS/Programs drive is an Intel 730 580GB SSD. This has a 200GB partition for OS /Programs and the reminder for the active files. The mechanical HD has partitions for libraries, program-related, archive, and media files.
Cheers,
BambiBoom