Hi and thanks for your question. My name is Tim and I'm an independent Microsoft Adviser. Let's see if we can solve the problem together.
With the information provided, I would assume the uninstall process has worked to an extent, but there are ways to manually remove steam. You'll need to be comfortable with Regedit but the process is outlined here:
Exit Steam if it is still running even after the uninstall.
Navigate to your Steam directory. (Typically C:\Program Files\Steam or C:\Program Files\Valve\Steam
If you wish to save your game files for a future installation of Steam, copy your steamapps folder outside of your Steam directory.
Delete all of the contents of your Steam directory.
Go to Start > Run and type in regedit.
- For 32-bit operating systems:
In the left-hand column of your registry editor, navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Valve.
Right-click on Valve and select Delete.
- For 64-bit operating systems:
In the left-hand column of your registry editor, navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Valve.
Right-click on Valve and select Delete.
In the left-hand column of your registry editor, navigate to: HKEY_CURRENT_USER\Software\Valve\Steam.
Right-click on Valve select Delete.
Close your Registry Editor.
Source: https://support.steampowered.com/kb_article.php...
Note: This is a non-Microsoft website. The page appears to be providing accurate, safe information. Watch out for ads on the site that may advertise products frequently classified as a PUP (Potentially Unwanted Products). Thoroughly research any product advertised on the site before you decide to download and install it.