Is there any solutions to keep fonts more than 450?

Having fonts on your hard disk and having fonts installed on your system are different things. All the fonts that stay in the fonts folder under Windows folder are the ones that are installed fonts.

In short you can have a separate folder created to store the fonts that you may or may not install. I have over 7000 fonts on my hard disk saved in a separate folder but have only about 350 fonts that are installed on my machine i.e. they appear in my fonts directory.

I use Bitstream Font Navigator to manage my fonts. This application can install or uninstall fonts at ease. The fonts can be installed or uninstalled at a button click.