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Welcome to the TenForums @whowas
Next time this happens please take a screen shot with the task bar included. Many times the Icon of the the offending task will be on the task bar with a small blue underline.
When this started to happen had you uninstalled any programs or had your Virus scanner alerted you to any issues?
I don't believe this is a memory issue but a quick test is simply. Close all your apps. Press the Windows key + R, type in mdsched, click restart my computer. Watch the scan, if any errors you need to isolate which stick is giving issues.
Do you recognize each program listed in Control Panel under programs?
Next time you start can you enter task manager and create a screen shot of everything in the start up tab.
Have you done a virus scan? What antivirus are you using? Can I suggest Malwarebytes from malwarebytes.com.
If that comes up clean you could also try hitmanpro from hitmanpro.com