Reset Z77E-ITX

I had initially installed windows 7 when I purchased my ASRock Z77E-ITX motherboard with no problems.

Then a suspected virus caused me to format my computer.

I think I didn't do this properly because it kept my old windows in my hard drive (so it could reformat(found out).

I don't know if this caused my computer issues or not.

So, with my inexperience focused on my plan to RE-RE-format fff: .When it asked me where to load the windows I clicked on the same place (C drive).

It is there I worked out that you need to have windows somewhere else to completely remove all data because it already had enough data on that drive which was not removed like I had hoped.

The second drive was completely empty like I wanted.

Now going into the UEFI I pressed some wrong buttons I thought.

Trying to completely reformat all drives and start again, but now I struggled to get to my desktop, but now it also comes up with I text saying no boot manager found.

When I do get to the desk top I find I only have one drive.

Sorry for the long story, but I though i had to give you a background.

Can someone tell me how to easily set my motherboard to where it was when I first bought it.

Thank you for your time & patience.

Jason