Error: HTTP Error 404.0 - Not Found

While you're opening your Sitecore instance then you got this type of error then don't worry about this.
I have one possible solution that i used while i faced this issue so just see the snapshot

So just open IIS(Internet Information Services) and expand sites and click on your site now on right side you see One Tab for Manage Website if site is not running then start the site.

Thanks for giving your attention !!!

Error: The Remote Computer refused the network connection

If you got this error while starting your Sitecore instance then i have a possible solution for this error:
Try this, may be you fix this issues.

Step:1 Search "Services" from your windows Search Button

Step.2 Now in Services search "SQL SERVER"

Step.3 Now check is it running or not, if not then right click on that and start this service.

 Hey Guys!!!, Problem Solved.

Enjoy Your Day.....!!!
If you got any type of error in Sitecore plz share to me so that i can also learn from you guys!!!