Boot camp disappeared after switching to windows

Hello, I recently switched from IOS to Windows using boot camp on my Mac since I wanted to play games that where only available on windows. The problem is since that day I cannot install even the smallest games because I have no space on disk for some reason. I tried restarting and resetting but that didn't do anything and my storage is still full after installing like one game. I can't even go back to IOS now since my boot camp disappeared and I can't find it in any way. Yes I tried restarting while holding the alt/option key but it didn't worked. Another thing. After restarting I was unable to install some applications due to an error ,,vcruntime140. dll was not found" and any tutorials about fixing it didn't helped. I would really appreciate the help with coming back to the earlier state of my computer or with fixing the storage/error problem. Thank you in advance