So back up you fonts:
1. Click Start==>Run==>Type regedit and click OK.
2. Locate the following registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Fonts
3. Click File->Export the Fonts registry as a backup. You can save it as backup.reg.
4. In the right panel, delete the items which contains the character "&".
If anything happened to you desktop font system ,just click on the back up files to get your font restore..