1) You should NEVER have both the Type 1 (the .pfb and .pfm files) and
Truetype (the .ttf) versions of a font installed on the same system.
Decide which one you want to use and remove the other.

2) Windows would not have put them into the system32 folder. You can,
and probably should, PROBABLY delete them with no consequences.

3) Use the "Install new fonts" option in the Fonts folder to add fonts.
(File / Install New Fonts).  Copying them in works, too, but has some
possible drawbacks.

4) It's possible (but very unlikely) that whatever you did resulted in
Windows' using the copy in System32. In that case you'll have to go
through an uninstall/reinstall.

 - Character

To check how your fonts are installed, fire up Regedit and look at My
Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
NT\CurrentVersion\Fonts

This contains a) fonts installed by being placed in the Fonts folder, and b)
fonts installed by using Control Panel > Fonts > Intall new font with the
'Copy to fonts folder' checkbox NOT checked. If you look at the individual
registry entries, those that are a file name with no path are in the fonts
folder; those with a full path are located elsewhere.

Most Microsoft apps install their fonts by putting them into the Fonts
folder; but not all. Equation editor doesn't.

The safe way to remove fonts that you think might not be useful is to create
another folder (called, eg, Font Archive) and move the font files to that.
You won't do any damage removing a font -- at worst, you'll render the
display rather ugly, in which case, move the font back (Windows won't let
you remove any of the really critical ones.)

The biggest trap with deleting fonts is when, in a couple of years time, you
retrieve an old document that you'd long forgotten about, that turns out to
be formatted using it.