Have you tried rebooting? If that still does not help try hitting Ctrl+alt+del select task manager, hit file in the top left corner, new task, explorer.exe
If that does not work do you mean it's freezing as it boots?
Based on the grammar of this question I'm presuming english is not your native language. (Not trying to be mean) if it is not, just type in your native language and I can use google translate to help!