Without knowing the error message its kind of like going to the doctors and saying:
YOU: Hi doc, I have a problem
DOC: Ok... what's problem?
YOU: No idea
I would just make sure that your PC's temps are ok, To do this you can download a program like hardware monitorhttp://www.cpuid.com/softwares/hwmonitor.html
Apart from that just keep an eye on it and try and get a screenshot if the error message pops up again.