Character Styles missing after switching from Mac to PC.

You'll probably have to redo the character styles to be compatible with your Windows fonts. Postscript Type 1 and TrueType fonts will be entirely different from the ones you used on the Mac platform. And sometimes, even OpenType font usage, where the same font files can be used on both platforms, will get scrambled in the transition if you're using different cuts of a font with the same name.

So you'll have to reconcile the discrepancies and tie all your paragraph/character styles to the fonts on your PC system. At least once. Create a new file, and set all your paragraph and character styles exactly as you want them to be used on your PC system. If you need to update a lot of files and/or use these styles in new documents on a regular basis, it might behoove you to name that file something like Copy Font Styles From Here.indd and put it somewhere it'll always be handy.

The good news is, after you do that, you can lather/rinse/repeat by then using the Load All Text Styles... command from flyaway menu in the Character Styles or Paragraph Styles panel. For each new/existing document, simply navigate yourself over to Copy Font Styles From Here.indd, hit the Open button, then, when the Load Styles dialog box opens click the Check All button and then the OK button, as shown below, to apply your updated paragraph and character styles to the target document.

Easy Peasy.

Hope this helps,

Randy