Reinstalling Windows (Lemme Explain First)

Hi, I will be purchasing a SSD soon but having doubts about how I want to go about reinstalling my OS into the SSD when I get it.
My plan is to install my OS into the SSD, and then enter the OS, then deleting my old OS on my HDD by simply clicking and dragging all the relative folders, and then deleting it.
But something tells me that it's not so simple, or I might seriously mess something up.
Just want to make sure I don't accidentally wipe out my entire HDD in attempts to delete the OS by getting rid of it like the sample picture presented.
Just so I ask the question in advance, how would I go about deleting the OS off my HDD without deleting everything else, as it will now act as storage whilst my new SSD acts as the OS.
Thanks in advance.

AddRAM said:

Ideally you`ll want to hook the hard drive back up, get your data off, then format the entire hard drive, then put your data back on.

Got it, but I was hoping I wouldn't have to go through all that, which was why I was trying to find an alternative way to delete the OS off the HDD and just leaving all the data as it is, but minus the OS.
Surely I could locate all the OS files and just deleting it?
This is to say that I'm in my newly installed SSD OS and deleting the HDD OS from there.
Thoughts?

No, the correct way for many reasons to uninstall an OS is to delete its partition in Disk Mgmt or using a partition manager.

It explains here how to get a perfect Clean Reinstall Windows 7. The first part includes everything that must be remembered to back up. You can use your HD as the backup. Then after install to the SSD plugged in alone, plug back in the HD to copy in your files as it explains how to do.

Once you're sure you have everything from the HD then either wipe it with Diskpart Clean Command to get it cleanest, or mark the old drive Inactive so it will delete in Disk Mgmt, repartition as a data drive. If you don't have enough space to back up all your files elsewhere then you can shrink the OS partition first, create a new partitionn to copy the excess files into, delete the OS partition and repartition it as another data partition on the drive.

gregrocker said:

If you don't have enough space to back up all your files elsewhere then you can shrink the OS partition first, create a new partitionn to copy the excess files into, delete the OS partition and repartition it as another data partition on the drive.

I don't suppose you could walk me through this process?
I'm currently looking at my drives at the moment in disk management and minitool partition.
Just so you know, the picture shown above isn't actually a shot of my actual drives, I just found that screenshot online just to show you what I was thinking about doing.
Bare in mind that the hard drive that I want to rid of it's OS has '96%' of it's memory occupied with data.
So I won't be able to split it's partition and put everything there whilst I delete the other partition.

AddRAM said:

Then just leave it as is until you can install another drive to transfer your data to.

Is there seriously no other alternative?
Although I'm here asking for help I still find it hard to believe there's no two ways about this.
I figured the partitioning would've been the next best step but seeing as I can't move anything that already has data on it it's a no no.
Damn.
So just to re-iterate, there's absolutely NOTHING one can do to delete the OS without having to delete everything else on the drive.
That the ONLY way to do what it is I want to do is to back up everything onto another drive, format the drive with the OS, and then transferring ALL the files back onto that HDD??
I still can't believe there's no other way, it's such a ridiculous lengthy process!

stuckstuck said:

gregrocker said:

If you don't have enough space to back up all your files elsewhere then you can shrink the OS partition first, create a new partitionn to copy the excess files into, delete the OS partition and repartition it as another data partition on the drive.

I don't suppose you could walk me through this process?
I'm currently looking at my drives at the moment in disk management and minitool partition.
Just so you know, the picture shown above isn't actually a shot of my actual drives, I just found that screenshot online just to show you what I was thinking about doing.
Bare in mind that the hard drive that I want to rid of it's OS has '96%' of it's memory occupied with data.
So I won't be able to split it's partition and put everything there whilst I delete the other partition.

Can we see a screenshot of Disk Management - How to Post a Screenshot of making sure you follow the instructions to show us all the sizes in the listings?

The way I've deleted the Windows folder easily without the permissioning problems is to boot into the Win7 installation media or System Repair Disk to browse to the Windows folder on C (which may have another drive letter in boot mode) as shown in Copy & Paste - in Windows Recovery Console.

Once you've found the Windows folder, right click it to Delete. This will take awhile prompting if you want certain folders to go, so just tick your agreement applying it to all folders. I did this earlier today and it took 10 minutes total.

I would delete the System Reserved partition which can also be done using the booted Win7 installation media by clicking Install Now, choosing Custom Install, then on the drive selection screen highlight only the 100mb SYstem Reserved partition to Delete it using the Drive Options in bottom right pictured in steps 7 and 8 of Clean Install Windows 7. Then cancel out of the install without touching any other partition.

If you have the System Active labels on C or another partition instead of System Reserved, mark it Inactive so that it isn't queried as a bootable drive any longer: Partition - Mark as Inactive - Windows 7 Forums. You can also do this on the System Reserved partition which may allow you to delete it in Disk Mgmt instead of using the Win7 installer at boot.