Check if you have any error or crashlog. Without further info all we can do is tell you to look in the previous posts on this thread.
Problem signature:
Problem Event Name: APPCRASH
Application Name: KunoichiSekiren.exe
Application Version: 2021.3.23.11039
Application Timestamp: 643d0ef3
Fault Module Name: UnityPlayer.dll
Fault Module Version: 2021.3.23.11039
Fault Module Timestamp: 643d0f02
Exception Code: c0000005
Exception Offset: 0000000000776fad
OS Version: 6.1.7601.2.1.0.256.1
Locale ID: 1033
Additional Information 1: 6371
Additional Information 2: 6371622b2cd7f0492a7f33257d222bdf
Additional Information 3: 0542
Additional Information 4: 054218d78688e7892e701fbff84e4fff
here the crashlog,im currently using windows 7 64bit