Maybe you installed an update or something. Did you back up your computer? Some of them will be backed up automatically. Now you can clean the disk. Maybe there is too much rubbish in it. This happened to you when I used vista, but not as much as you.

Even if it's cleaned up, it's useless. I also suggest that you don't use vista Optimizer, which is terrible. windows Optimizer is better. But your system is genuine, there is no need to use the optimizer, mainly for people who use pirated systems. The optimizer sometimes conflicts with the window.

I didn't say it myself, but someone at thinkpad computer repair station said it.