for us to base an opinion on but anyway here is my stab in the dark.
More often than not unresponsive applications is caused by shortage of memory, if you are short of memory then only the code for the current task can find room in memory to run and if a new task is started the code for it is most likely held in the swapfile on disk and something has to be rolled out of memory to make room for it to roll in and then to run. If the current task is higher priority than the requested task it will make the new task wait untill it is convenient to suspend and roll out, this gives the impression that the process has frozen. It may only be for a few seconds or it may be for a few minutes. As a general rule of thumb, if you run windows 7 you need a minimum of 2.0GB of memory, if vista, 1.5GB, and if xp, 1.0GB, so, how much have you got?
This situation can also be exacerbated by complex background applications like antivirus apps with all the bells and whistles, which one do you use?
I have windows 7 professional. Dell Latitude 5500, hard drive is only 40% full. All programs - including Microsoft Office 2007, Firefox, Windows explorer - stop responding, some times for seconds- other times minutes. This is starting to drive me up a wall. Especially if I am in the middle of burning a CD or DVD. There is no consistency with this. I could go days with no issues, then my computer freezes, starts troubleshooting itself, then fix's the same programs over and over again. any suggestions would be appreciated.