DCOM errors Server 2012 R2

Don't know where to start! Server 2012 R2 been working fine for months, now when I reboot it allows me to login but then everything freezes after about 5 minutes so cant use keyboard/mouse etc. It works fine in Safe Mode. I noticed there are a lot of DCOM errors in Event Log such as:

DCOM got error "1608" attempting to start the service 'ComSysApp' with arguments "unavailable" in order to run the server {blah blah"

DCOM got error "1804" attempting to start the service 'ShellHWDetection' with arguments "unavailable" in order to run the server {blah blah... different than above number}

I haven't made any changes apart from possibly installing updates. Server only installed about 6 months ago and used for learning SQL and couple of HyperV VMs.
 
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