I bought a couple of theme from mythemeshop and after installing these themes, 404 errors of my sites increased dramatically based on the google webmaster tool
I contacted mythemeshop support center and they informed that these URL are .htm and eventually it will fade away. Further they asked me resaved the permalink section of wordpress again. I did that too.
Technically, if somebody spam on my comments section, when google crawler comes in, it create a .htm URLs and say, 404 errors. Basically, these URLs are created based on NOFOLLOW links
I blocked the commenting entirely but still spammers come and insert comments ☺
Please look at the screen shot of Google webmaster that I have attached.
1. Will this hurt my Google ranking
2. Is there a way to stop these spamming completely or fix this .htm URL creation
3. Will Google avoid coming to my site since it creates a lot of 404 errors