My old windows 7 build has recently started to 'hang' for 3 or 4 minutes, I think its usually after its been 'sleeping' (but I'm not sure about that).
Its totally hung up for a period of time, then begins to respond normally.
While its hung I can't bring up Task Manager or anything else to try to determine whats the problem.
I've uninstalled everything that I had installed recently but no change.
Also scanned for viruses (Malwarebytes, Microsoft Security Essentials), nothing found.
Any ideas or help would be appreciated.