Can't connect MacBook Air to iCloud?

I just upgraded to Yosemite yesterday, and since then I've had extreme difficulty using any application that either involves iCloud, or any sort of password prompt.  Most noticeably the App Store and iTunes crash basically every time I try to open them.  I can't even log into Spotify, which as far as I know is not affiliated with the cloud in any way.  I was thinking it might be a web connectivity issue but I'm able to use Google Chrome just fine (albeit with a noticeable amount of lag in comparison to Mavericks.)  So, I'm at a loss for what to do, and without many options to do it, as I have foolishly neglected to even touch my Time Machine for the duration of my ownership of this computer.  Thanks for your help!
Specs:
MacBook Air (11-inch, Mid 2011)
Processor 1.6 GHz Intel Core i5
Memory 2 GB 1333 MHz DDR3
Graphics Intel HD Graphics 3000 288 MB

Try:
- Resetting the iPOd. Nothing will be lost
Reset iPod touch:  Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Pwer off and then back on yur router
- Reset network settings: Settings>General>Reset>Reet Network Settings
- iPhone and iPod touch: Troubleshooting Wi-Fi networks and connections

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