Whenever I try to open a new vault, or try to access a vault within a folder in order to open it, obsidian freezes. Can someone help me?
We need to know more about your setup.
Operating system, local folder of Obsidian vault, etc.
Windows 11 is the OS. Laptop Acer A515-55G.
Concerning the folder, it cannot open anytype of folder, and I can not create a new vault, because of freezing of obsidian.
if you need further information let me know 
You did not let me know about the local folder.
Anyway, there are many threads about various issues, concerning Windows Defender (firewall) as well.
Try uninstalling and reinstalling.
Before reinstall try deleting all files in the Appdata folder.
See: How Obsidian stores data - Obsidian Help
In Win10, it is (probably same in Win11 as well):
Windows:
C:\Users\<username>\AppData\Roaming\obsidian
I deleted everything in the appdata folder concerning obsidian, uninstalled, and reinstalled obsidian, same issue.
How can I do that with the windows defense. I read the post of a guy who had that issue and solved it, but I do not know how to do that. I do not know how to change the setting of windows defense.
I am not sure if it’s Defender, to be fair.
You may need to search with other key words or wait for someone who has a better idea.
what did you mean with folder location?
There are also many threads where the location of one’s private files is an issue or is being asked first time around.
For example, SD card or other iffy places.