PARTITION QUESTION (not yelling)
In regards to the partition problem, windows when it gets to that stage will automatically show you depending if you have partitioned it already or if it unformatted you will see in the window something like this:
Now it sounds like you have more than those partitions. You have 2 choices, you can fix it here or fix it once the computer is in Windows. Remember if you install it on too small of a partition then you will create a major headache. So put your mouse cursor and then click on the partitions to be delete (I always go from the bottom up). You will then have 1 drive. Now if you don't need to have different partitions, then select the drive remaining.
So to answer your second part of the first question, they were either left over from a previous install, or where you created new partitions on that drive. Double check them before deleting in case you had partition a drive for a reason, like store document/videos/photos etc.
REPLACING MOTHERBOARD/RAM AND REINSTALL(Not Yelling)
Now if you haven't activated it yet, there are two things to worry about. I activated my version about a week after the deadline and there was no problem. If you read into the Microsoft language it seems to indicate you had to have reserved your copy by the deadline but didn't say much about activation and registration.
If your network was plugged in when you installed Windows 10 you may have already activated it. Here is an articles that shows you how to validate whether your copy is activated or not.
Now Microsoft originally designed Windows 10 to be tied to a motherboard. It could not (if you have a free copy) by reinstall on a different motherboard. Some minor item like memory it was not suppose to make an issue, but I have heard and read, the CPU, Motherboard and GPU are the three things it looks at.
Now as to the reinstall. I am one of those who wants a perfect install on the motherboard I will be running it on. Others might say it shouldn't be an issue since you are putting in the exact same parts, if that is what is meant by (same product - you used this in your 1st paragraph). However they could have made even a slight change that didn't warrant what is a called a revision.
If you look over the top surface of the motherboard you should look for a revision number. If you don't see or can't find you need to visit the site of the company who made your motherboard to find out where it appears, usually a FAQ or going into support and searching will yield you the info. If they aren't the same revision you might or might not run into issues. Depending on how much you would need to install, I personally would say if it is a small amount then redo it. If you don't feel comfortable with the reinstall, you could try to use the hard drive as is. Just remember that revision could have changed almost anything and it might or might cause windows issues.
Memory (RAM) you also just make sure you have the same revision, speed, cas Latency, etc. in general you will see a 4 digit number which represents the speed, like 1400, 2600 and so on. Cas Latency will show as either Cx where x is the cas latency or you will see something like this (example from Corsair) 19-25-25-45 , where 19 is the cas others will put it on the end.
THE MOST IMPORTANT (not yelling) is to remember each bios setting from the motherboard you will be swapping. As for example you might have installed using the UEFI method or the standard bios(sometimes called Legacy). As your drive will reflect the method and have the wrong one will most certainly cause your computer not to boot.
Sorry if I it seems I am talking down to you, however I don't know your level of skill so I try to assume you have only basic skills/knowledge. If I have insulted you I am sorry, that was not my intention.
FINAL ANSWERS (not yelling)
"
Hi, I am using Windows 10 64-bit Professional. I have not activated Windows yet. If I replace the motherboard and the RAM by the same products, do I need to reinstall Windows? Is it better to do it again?""
Personally if you don't have a huge amount of programs to reinstall, fresh and clean is always the preference, especially since we are talking motherboard and the risk of something changed, but you should have, if parts are the same product and revision (memory/RAM) and motherboard just use the hard drive you have. I don't know why changing motherboard, if there is an issue there is a small chance it will show up in problems while running windows 10 on the same motherboard. You might have to activate it, if it did activate, look at
https://www.digitalcitizen.life/how-learn-copy-windows-7-windows-8-activated to make sure you didn't or Windows didn't do it for you. If re-activating it will either same okay or it will require you to call a number. Tell them bad board/ram using same parts and they would not give you grief
"Also, last time when I reinstalled Windows on the same computer, even I chose installing new Windows, it asked me which partitions to install. I did not create those partitions. Where they created automatically when I installed Windows the first time? During the reinstallation, did Windows overwrite on the corresponding partitions or now I get double the number of partitions than intended? "
WARNING (not yelling)
Make sure you have gone over those partitions and haved saved any data you need if you plan to change partition sizes. Remember they also could be missing a drive letter so also verify through Computer Management that all partitions have a drive letter.
PARTITIONS
If the drive was already formatted and partitioned and it is the way you like it, then you should keep it but still backup any important files/docs/videos/etc in case the install goes bad.
I have in most cases gone with the attitude of perfect install - meaning I would redo it and provide a fresh copy, unless there too many programs installed and it would take time to get them installed, then you will have to accept the risk that Windows might get corrupted or a change in a minor part on the motherboard could create issues.
When you reinstall windows 10 install (7,8 as well) will show the drives you have in your computer and what partitions there are. That is why it is important to check all partitions and backup what you need before the reinstall should you choose that route.. If you want to rearrange size, then you can delete the partitions and then create new ones. Just remember C drive needs to be given plenty of room if you are going with a Windows on C: and all other items on D:, if not partitioning, then nothing to worry about.
I hope this helps,
Saberasus007
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