Help!! - Yosemite/FileVault Disaster Killing my Battery

How do I stop FileVault after enabling it during Yosemite installation? It is saying it will take a YEAR to encrypt my files. I have 220 GB of content, apps etc included, on my computer.
Looks like the process has stalled but it keeps trying to proceed with the result that my battery is overheating and drains down very quickly. FileVault is literally killing my battery.
Having reviewed some posts here, I tried the Command-Option-P-R technique to reset RAM during restart (to no avail), and Disk Utility cannot switch off the encryption (option to do so is grayed out).
Looking at Activity Monitor, I see that something called SystemUIServer is using 60% of CPU.
MY QUESTIONS: Is there anything I can "Force Quit" to stop FileVault? If not, can I reinstall Yosemite without enabling FileVault? If so, how do I do that? (I upgraded to Yosemite via the Mac App Store.)

If not, can I reinstall Yosemite without enabling FileVault? If so, how do I do that? (I upgraded to Yosemite via the Mac App Store.)
You do not have to enable File Vault. Do a backup. Boot to the Recovery Volume (command - R on a restart or hold down the option key during a restart and select Recovery Volume). Run Disk Utility Verify/Repair and Repair Permissions until you get no errors. Then re-install the OS.
OS X Recovery
OS X Recovery (2)

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<TABLE CELLPADDING=0 CELLSPACING=0 WIDTH=100%><TR><TD>Hope this helps
Dave</TD><TD ALIGN="RIGHT">U</TD></TR></TABLE>

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Help!! - Yosemite/FileVault Disaster Killing my Battery

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