Hi .Just got new Inspiron 5150 a week ago.(2.66GHz speed,512-RAM,64mb NVidia card)The problem is that after getting a feel of it I came to conclusion that all the applications on my laptop work fine for couple of minutes then there is some kind of slowdown effect for 5 sec and then everything is fine for about 2 min and then a new 5 sec slowdown follows.It effects DVD/CD playback(screen freezes and becomes jerky for 5 sec,kind of stuttering effect,same with playing CDs).Also webpage scrolling gets out of control for 5 sec every 2 min, and you can feel it when you  trying to download or safe a picture.Also typing is effected.I get missing letters once in a while and finally  when I double click on an icon on my desktop once in a while the program doesn't open for few sec.when in most cases it opens fast.Is there anybody out there who knows what part of computer is responsible for this kind of behavior.Any help will be greatly appriciated

                                                                                                                                                                                            Thank you. Leo777