The following list was posted on a community forum, but was sourced from elsewhere.

Do not delete the following System Fonts:

Arial (TrueType)
Arial Bold (TrueType)
Arial Bold Italic (TrueType)
Arial Italic (TrueType)
Courier 10,12,15 (VGA res)
Courier New (TrueType)
Courier New Bold (TrueType)
Courier New Bold Italic (TrueType)
Courier New Italic (TrueType)
Marlett (Windows 95/98)*
Modern (Plotter)
MS Sans Serif 8,10,12,14,18,24 (VGA res)
MS Serif 8,10,12,14,18,24 (VGA res)
Roman (Plotter)
Script (Plotter)
Small fonts (VGA res)
Symbol (TrueType)
Symbol 8,10,12,14,18,24 (VGA res)
Times New Roman (TrueType) -
Times New Roman Bold (TrueType)
Times New Roman Bold Italic (TrueType)
Times New Roman Italic (TrueType)
Wingdings (TrueType)
Any font with a red A for its icon.
Any font that begins with the letters MS.

*Marlett is a hidden system file and it will not show up in a search, however, it may show up in your program font lists.

Program Specific Fonts Required:

Some fonts are required by particular common programs. Do not delete these also.

Avant Garde Oblique BT (TrueType)
Avant Garde Medium BT (TrueType)
Avant Garde Medium Oblique BT (TrueType)
Book BT (TrueType)
CommonBullets (TrueType)
FuturaMedcondBT (Corel’s # TT0201M.TTF)

Print Artist

Palisade

Windows Draw

Swiss921 BT
(Also see page 4 of the manual for Windows Draw 6 Print Studio, and page 27 of the manual for Complete Publisher ‘99 for a list of fonts that must be installed for the text styles and templates to appear properly.)

Create-a-card

Swiss721 BT
(Create-a-card also has fonts that begin with CAC - these can be removed, however, some of the included projects may not display correctly.)

Internet Web Browsers

Webdings

Office 97 (including Outlook 98)

Tahoma
Quickbooks
Four fonts that all start with "Quicktype"
MS Bookshelf
Three fonts called Bookshelf Symbols 1-3

Picture It

Comic Sans and Comic BD