Lee
The problems with Windows Update appear to be resolved.
Can you please upload to your OneDrive a Print Screen image obtained when your problem with World of Warcraft occurs?
In Windows 7 use Ctrl+Shift+Esc rather than Ctrl+Alt+Del. It gets you to Task Manager quicker. Select Task Manager, the Performance tab, Resource Monitor, and Memory tab. What are the figures for Hardware Reserved, In Use, Modified, Standby and Free?
Please download Speccy and upload a copy of the report it produces to OneDrive. It helps to obtain the report at a time when the system is under pressure and temperatures may be higher than normal:
http://www.piriform.com/docs/speccy/using-speccy
Please download and run ADWCleaner and upload a copy of the report produced to your OneDrive. Remove all that it finds. :
http://www.bleepingcomputer.com/download/adwcleaner/
I suggest you take the precaution of creating a system restore point before running ADWCleaner, to guard against unforeseen consequences. Select Start, Control Panel, System, System Protection, and click the Create button.