Process Monitor : CriticAL errors

My PC has slowed down dramatically in recent weeks and I have been running ProcMon to try to see what the bottleneck might be.  However as a newbie to ProcMon it is difficult to track down the event(s) that might be the cause of the problem.  e.g. Lots of "Name Not Found" entries look problematic but I understand from other forum entries that they probably aren't.

Could someone please advise which critical errors to investigate?

Thanks