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Thank you for your comfort and comment, Ms nijimu and Ms deardiary.
There are so many trouble. Indeed, my glasses were broken last friday. (Fortunately, lens is safe. I temporarily repair it with string and use it.) I never imagined that trouble would happen with my PC only two days later!
I think almost troubles were caused by my misses and grown into destructive situations by surroundings. In Japan, they would not be so serious situation. But in this country...

I would like to response Ms nijimu's comment, but there are only a few PCs in lab., and they are very busy always (except lunch time!). So I can not spend enough time to response you (I'm not good at english...). Sorry. Sometime...