Videos that I watch on sites like youtube will stop buffering every 1-2 minutes and to get it going I have to skip a little of the progress bar and then it will stop again. I can't download anything off the internet because it stops downloading before it is done and just quits. I have had this problem before but no one touched it and it started to work again after about a month. My ps3 now is also lagging behind while playing online, which never happened before. Firefox no longer works at all and some sites on internet explorer will not open like hot mail or gmail. Internet is also just going about 1/2 as fast as before. I don't know what caused this change. I have defragmented and run a virus scan and nothing has changed. What do I do?