...ATM and Pagemaker are pretty much redundant now, ATM is part of XP installation for use with postscript fonts, to install it again isn't required unless you are running a lower version of windows...
Installing PostScript Type 1 Fonts in Windows XP or 2000
PostScript Type 1 support is built into Windows XP and Windows 2000.
We recommend installing only one format — OpenType, TrueType, or PostScript — of a font. Installing two or more formats of the same font may cause problems when you try to use, view, or print the font.
Choose Start > Settings > Control Panel
Note: In Windows XP, choose Start > Control Panel
Double-click the Fonts folder.
Choose File > Install New Font.
Locate the fonts you want to install.
In the Drives list, select the drive and the folder containing the fonts you want to install.
In the Folders list, select a folder that contains the fonts you want to install. (Make sure you have unzipped them first.) The fonts in the folder appear under List of Fonts.
Select the fonts to install. To select more than one font, hold down the CTRL key and click each font.
To copy the fonts to the Fonts folder, make sure the Copy fonts to the Fonts folder check box is selected.
Note: If installing fonts from a floppy disk or a CD-ROM, you should make sure this check box is selected. Otherwise, to use the fonts in your applications, you must always keep the disk in the disk drive.
Click OK to install the fonts.
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...look into getting a font management tool, there are free ones for XP, one good one used by mac users is now available free for windows (in beta):
...another one is fontexplorer from linotype here:
Andrew