Updated to Mavericks, now text is pixelated. How can I resolve this?

Mid 2010 Mac mini
Processor  2.4 GHz Intel Core 2 Duo
Memory  4 GB 1067 MHz DDR3
Graphics  NVIDIA GeForce 320M 256 MB
Software  OS X 10.9 (13A603)
Display Dynex 46" monitor
I updated to Mavericks today.  When my mini came back online, I had serious display issues that I've somewhat managed to resolve.  The most galring issue is that all text, be it text on a website, text in apps, text of the OS windows, all text everywhere is pixelated.  Glaringly so.  Like 8-bit-style pixelated.  Fuzzy, too.  Can anyone help me understand what has happened and how I can resolve it, please?
The other display issues I'm having have to do with colour settings and screen resolution.  I've been playing with my monitor settings and the OS settings and none of this has had any affect on the pixelation problem, as far as I can tell.  Selecting "Best for Display" from System Preferences>Displays is the only setting I can choose that doesn't stretch the display beyond the edges of the screen.
Thank you!

Hello,
If 10.7.0 or later...
Bootup holding CMD+r, or the Option/alt key to boot from the Restore partition & use Disk Utility from there to Repair the Disk, then Repair Permissions.
If that doesn't help Reinstall the OS.

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