streaming video problem

my computer seems to have developed a problem. when I'm watching streaming video it acts like it is buffering every 10 seconds or so making it appear choppy. I'm connected to high speed dsl and all was fine yesterday. the system is free of malware and everything checks out ok. I did have a problem yesterday. when I navigated to a web site that I use all the time all of a sudden I got a stack overflow error message which replicated itself until IE crashed. first ime I ever saw that error message and I haven't seen it since then. could I possibly have a memory ram stick that is acting up and should be replaced? thanks

 

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