i've had no problem running videos w/my recently purchased Acer Aspire 5251-1245. I watch Hulu and Youtube and have had no problems until the last couple of days. Now it keeps stalling, spooling, and Videos running slow and keep stalling, I have to put it into pause mode for a minutes or two, then it only runs for a minute, then stalls again. This happened very recently, and I also noticed a recent prompt telling me that CPU usage was high. This has only happened in the last several days after 3 months of use w/no problem. What is the deal?

My first guess is that you've picked up some kind of malware. To find out, post here: Spyware, Adware, Viruses and Malware Removal

Start with the first Sticky: Read This First - IMPORTANT Instructions (updated 8/1/2010)