My laptop has 16gb. 4gb is probably the issue. What type of PC is it? You may want to buy more memory.
Looks like disk space isn't an issue. Is it an SSD drive?
Do a left click on "my computer" or "this pc" depends on OS.
Your disk drives will be displayed.
Right click on your "C:" drive and then on "Properties".
On Windows 11 there will be a "HARDWARE" item, click on that to find out what kind of drive it is. Notice that all of mine are SSD. That is solid state. HDD would be the standard hard drive....much slower.
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If your disk is an HDD then you may wish to "DEFRAGMENT" it. That will help speed up access. Go to "TOOLS" on the above page.
What OS are you on? On Windows 11 it will say "Task Manager".