I'll start with George, but
@Guend1 pay attention too, as these are similar issues between your Threads, and welcome to linux.org
First things first.
1. Make sure you have Windows 7 safeguarded, have a Rescue or Recovery disk/stick created, using the onboard facility.
2. RUN A DEFRAG - Windows have historically had a bad record for storing immovable system files near the end of the drive or disk, a defrag can sometimes draw these recalcitrant files and folders back in closer, allowing us to reduce the size of the affected partition.
3. Windows Snipping Tool defaults to .png, and each of you can provide a screenshot from Disk Management to give us a better idea of how your partitions are placed currently.
The following shots are from my Disk Management in Windows 10 I only keep on a leash to help here, your Disk Managements may differ slightly.
If you want to Post fullsize screenshots here, see my Thread at
https://www.linux.org/threads/posting-screenshots-at-this-site-read-this-for-easy-way.21722/
SCREENSHOT 1
If you need to enlarge further, hold your Control button and click your Plus + button as necessary, Control-0 (zero) will reset.
This is derived from my, at left side, right-clicking Disk 0, then Properties and Volumes. It shows MBR as being used because I use this drive for helping here with older computers. This is my 2TB internal SATA HDD.
SCREENSHOT 2
This one shows my performing the same exercise but with Disk 1 which is my 256 GB SSD formatted to GPT.
This holds my Windows 10 on C: , neutered down to 55 GB, but that is a bit low for most. You need to allow an overhead of about 15% for defrags.
If I could not have done that with the inbuilt SSD, then I could use (& do) my Disk 2 which is the external 4 TB WD My Book, formatted to GPT. In total, I run about 50 Linux on this system setup. Dell Inspiron 5770.
On my secondary rig, a Toshiba Satellite laptop with 1 TB SATA, I have 50 partitions (about 45 Linux).
Just a word to the wise - GParted is one of my fave tools, but best used
after shrinking Windows. We are better using Windows to trick itself to allow us to shrink it, then Linux from there on.
Cheers
Chris Turner
wizardfromoz