Update to 10.10.3 Failed Now MacPro is Almost Unusable

The update to 10.10.3 failed -- got stuck at 99% so I powered down and after many attempts I got back to the desktop. I am now still on 10.10.2 but my MacPro has slowed to a crawl. I was advised that Yosemite needs more memory (I have 2GB) so I ordered 8GB more and it's on its way. However I need to use my computer but it's almost unusable -- programs open so slow then automatically shut down. I really don't think the memory will fix this as I've been running Yosemite for a while and just in the last few days has it been brought to it's knees.
Is there anything else that I can check to see why it is so so so slow?
Thanks
Alan

Activity Monitor - Mavericks also Yosemite
Activity Monitor in Mavericks has significant changes
Performance Guide
Why is my computer slow
Why your Mac runs slower than it should
Slow Mac After Mavericks
Things you can do to resolve slowdowns see post by Kappy
6 Easy Tips to Speed Up OS X Yosemite on Your Mac
Try running this program and then copy and paste the output in a reply. The program was created by Etresoft, a frequent contributor. Please use copy and paste as screen shots can be hard to read.
Etrecheck – System Information

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Update to 10.10.3 Failed Now MacPro is Almost Unusable

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