Reset Admin Password in Windows 8

Hello Experts,

I am looking forward for your help. I have Dell inspiron 15R. Its a new machine & I am having two accounts i.e. Admin & User Account. I forget the password for Admin account. User account was created for normal day to day work.

Can you please suggest me how I can reset the windows 8 admin password. I tried to find solution in google but the given solution involves to pay for software to do so. Is there any other way (i.e. Free) work around to resolve my problem?

Thanks,
Amit