Did you uninstall the drivers of your previous card and possibly disable it in the bios (many on-board cards disable automatically when a pci-e card is installed)? The drivers on the cd shipped with the card might work better than the latest ones which may have features not available in your card.
Have you experimented with different font sizes in the game Options->Preferences->GUI->IconFontSize?
Before installing the new card I went to the device manager and deleted the onboard device and drivers. i then installed the new card, went to bios and noted the onboard video was disabled. I then installed the new drivers, then did a driver update.
I just went back to the Device Manager and I found "nvdia eforce pci system management" under "system devices". I right clicked and under properties it said no driver available.
I do have the font set to maximum size.
I should also note the fuzzy font is only in AH. All fonts like on the desk top and this forum are sharp and clean.