Can I upgrade from Windows 7 32 bit to Windows 7 64 bit without losing data?

I want to play Fallout 4 and I found out I need 64bit system in order to play it, but I have 32bit system and I'm capable of upgrading.

Can I reinstall Windows without losing pictures and that stuff if I put them in D:\files or something like that?

I don't want to buy more storage just to save my files.

I also don't want to use Google drive or similar because I have a lot of pictures on my PC.

Answer

Can I upgrade from Windows 7 32 bit to Windows 7 64 bit without losing data?

If you want to move from a 32-bit version of Windows to a 64-bit
version of Windows 7 or vice versa, you'll need to back up your
files and choose the Custom option during Windows 7 installation.
Then, you'll need to restore your files and reinstall your programs.

For more information about performing a custom installation, see
Installing and reinstalling Windows 7‍.

Notes

To install a 64-bit version of Windows 7 on a computer running a
32-bit version of Windows, you'll need to start, or boot, your
computer using a 64-bit Windows 7 installation disc or files.

If you start your computer using a 64-bit Windows 7 installation disc

or files, but your computer isn't capable of running a 64-bit version
of Windows, you'll see a Windows Boot Manager error. You'll need to
use a 32-bit Windows 7 installation disc or files instead.

Source 32-bit and 64-bit Windows: frequently asked questions