Very ODD Avast occurrence

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I had the most up to date version of Avast installed, yesterday some odd  
behavior started happening with my pc, downloading became VERY slow,  
closed all windows and CPU was max, then... later I rebooted out of  
concern what was going on (hacker?) things felt not right

I rebooted and the Avast version looked slightly 'off' I checked the  
version which turned out to be older... little alarmed, so I replaced it  
with Avira, PC seems is much faster now

I wonder how Avast reverted to an older version, which was never on my  
machine in the first place (I had just reinstalled win8 so I didn't  
update program from one version to the next) spooky...

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