I recently installed the latest version of the IAN Symbol Libraries(ian_symbols_4_1_1_full.exe), and discovered that the installation created a rogue folder called Presets at the root of my C: drive (C:\Presets). This has been confirmed by AdrianJ as an error in creation of the install package, and not a figment of my imagination (inside joke for AdrianJ:). AdrianJ has indicated that he will fix this minor glitch and rebuild the installer.
In the meantime, the folder is, as the subject indicates, extraneous and should you find this folder, it can de deleted.
FYI - While composing this note, I installed the Libraries on another computer to check something, and discovered that if Illustrator is NOT installed, the symbols/swatches are installed under c:\presets.
patrick