Can I install 7 64 bit on a 32 bit 7 system on a diifferent drive?

I have 32 bit Windows 7 Ultimate installed on my C drive. I want to install 64 bit Windows 7 on my D drive. I have several questions.

1. I have enough space on my D drive but would the installation wipe the D drive clean while installing?

2. Is it any concern if I install a different version than Ultimate on D drive?

3. Would I be able to access and use software already installed on C or D drive?

4. How will Windows handle boot? Will there be a selection screen at boot?

I'm doing this in order to utilize the extra 0,75 gb ram (I have 4 gbs of ram installed currently) to have better performance in some games and to be able to use DX11 features with a certain game because it has issues with 32 bit Windows 7 for now.

1. Ok, I'll just create a new drive then.

2. Is it any concern if I install a different version than Ultimate on the new drive?

4. I'm not sure how to unplug my C drive. Is it really necessary? I thought using EasyBCD to make a boot selection screen would work if Windows doesn't do it itself. I did that when I tried Windows 8 on my netbook along with Windows 7.

As for your question, I have already answered that in my first post. I'll just copy and paste. You should've missed it.

I'm doing this in order to utilize the extra 0,75 gb ram (I have 4 gbs of ram installed currently) to have better performance in some games and to be able to use DX11 features with a certain game because it has issues with 32 bit Windows 7 for now.

I'm a little confused. Don't you call partitions also drive? I have one harddisk. It has C, D and E partitions currently. I also call them C, D and E drives. I didn't realize it was wrong or have I still not got it?

You use the term "Drive" - that is often used for another prtition on the same disk, but the correct semantic is for a different physical drive.

Sorry but I don't understand this sentence. Maybe the second "for" is extra there. When you leave the "for" out it makes sense. With "for" I feel the sentence must continue but it's left incomplete.

I didn't know I needed another key but I'll buy it.

This is completely irrelevant. You can run only 1 system at a time.

Why is it irrelevant? I don't think you understand my words correctly. I'm using 32 bit Windows 7 currently and it can utilize 3,25 gbs of 4 gbs ram I have total. When I install Windows 7 64 bit on a newly created partition, it will use all the ram I have. Thus, the extra 0,75 ram. I'm not planning on running 64 bit system on virtual machine or something. I'll boot into actual 64 bit OS and install the game I'm having problems there. I hope it is clear now.

Ah, thanks. I didn't know how that word was used as the whole unit. (I'm training to be an English teacher.)

It is also for that game I mentioned before, which needs 64 bit system to use DX11 properly. The awaited patch for the game completely removed usage of DirectX 11 features from the game for 32 bit systems. Maybe you're right. I'll consider the choice between SSD and a 64 bit system. I'm aware that little extra ram won't do much but I'm expecting a little more smoothness in some games.

Thanks for all your help.

Thanks again. I'll check out Newegg.