If the unit is locking, something big is happening in the background. Use Cltr-Alt-Esc to open the Task Manager to see what processes are hogging memory (under processes).
A real big problem is malware (viruses, and spyware) so a look at the following site may help.
Bleeping Computer - Technical Support and Computer Help
Look for MalwarBytes, SuperAntiSpyware, and ComboFix when all else fails.
If you are adventurous, try the Junkware Removal tool before ComboFix.
If you are cautious, talk to your local PC shop (get recomendations) and have them check the unit for issues.
And stay away from fruit! Apple is a nice product but has such a small market share now that the cost of applications and support don't make it worthwhile (IMHO).
2011 PrimeTime Tracer 2600rls
2001 GMC Yukon XL 2500, 6.0L 4.10:1 axle ratio
Nights camping 2014 - 17
2013 - 15