Dual boot screen even though I only have one OS installed

Hey! Today I did a clean win7 install some hours ago but I had to change some settings to disable UEFI boot on the bios or something similar I set the main boot thingy to DVD-RAM instead of DVD-RAM UEFI, so as to boot from the cd and create a master boot record.

Everything went fine and I don't know if this is related to what I just mentioned but when I boot up my PC I get to the dual boot screen where it lets you choose what OS you want to use. I get two options Windows 7 (the one I installed) and Windows 8.1 which I never had lol, I haven't picked Win8.1 on the menu yet because I'm afraid something terrible might happen and I might lose all my data (I got 2 HDDs both are MBR, in one I got all my important stuff and the other one is for the OS). Is there a reason why that happens and a way to disable it? Thanks in advance. My motherboard is a Gigabyte Gaming 3.

Hey, thank you for your reply. Here it is:

Alright I had it fixed today! It was one search away but I swear I always search it's just that I did this at like 3AM and was halfway dead so the words I inputted on the google search weren't the right ones apparently. What you have to do is:

Open msconfig, go to the bootloader tab, and delete the OS that is no longer on your system, save, exit (you may have to restart).

I don't know what caused it but this fixed it! Thanks a lot for your answer though! :)

You are welcome :)

AddRAM said:

Why is H marked Active and has the system files on it ???

You installed windows with 2 drives plugged in didn`t you ??

Is H just a data storage drive ?

If so, it`s wrong.

Hey, thanks for your reply. I got your message.

The system files are on C:/. I've kept H untouched through various formats and never had any issues (I mainly keep movies, shows and some games backups in there).

And yeah I installed Windows on my SSD (C:/) but didn't alter the other one in any way!. I've also seen this problem is quite common among users according to google, but I don't know, why do you say it's wrong?

AddRAM said:

If that is your current layout of disk management, then it`s wrong, your system files are not on C, and C is not marked active.

H should not have the system files on it and it should not be marked active.

If you ever format H, windows would not boot.

If you have a different more current picture of DM, then please post it.

C should look like this.

I see, how can I prevent this from happening next time I install windows? in the partition screen I had Disk 0 (SSD) and Disk 1 (H). I chose Disk 0 (and formatted it) but for some reason it says System on H. Thanks for the warning, i don't think I'll format H right now but you never know . I've never formatted H (I bought this computer exactly 1 year and 1 month ago) but never installed any OS's on it either. Every OS I've installed was on my SSD