What Happened to my PC?

I'm finally done with gardening after the rain this afternoon. I worked in our garden until 8:30 PM tonight. My dear hubby told me to stop around 7PM but I still continue to work..It rained again this afternoon. We had again thunder and lighting but not that much as yesterday. At this time, I was in front of my PC running the anti-virus program. As I heard one lighting, my PC and the light inside the PC room, turned off and on again. Is it the effect of the lightning? I guess so because yesterday we had a total black-out due to thunder and lightning. The main switch which I don't know automatically turned-off. My husband fix it as he came home from work.

As my PC turned-on again, there are some messages that appeared to my screen. I had the chance to write it down while the system is checking for some thing. here it is;

"CHKDSK is verifying the files (stage 1 of 3)
checking file system in C:
The type of the file system is NTFS.
One of your disk needs to be checked for consistency.
You may cancel the disk check, but it is strongly recommended that you continue.
Windows will now check the disk."

After the PC was check, it begin to load again and do its normal thing. I am just scared when this happen because I am not a computer techie..I am happy that I am here again! I guess it is safe to turn-off our computer or any electronic gadget when there are thunder and lightning.