Hey all, I have a dell Inspiron 9400 laptop, but it has been doing a strange thing this past year. When I leave my computer on for around 10 hours with cable internet on, it starts to run very sluggish...and when I try to activate any application it will come up with an error message stating that there are not enough system resources to fulfill the task. Does anyone know what this error means, and what I can do to fix it?

I have reformatted my hard drive once, but it started doing it again after a month when I had to put symantec anti-virus on my comp. I think it may be the anti virus software my uni makes me use for their internet. but my roomate doesnt get this error and he has the exact same comp as me. Has anyone had experience with this "Insufficient system resources to fulfill the task" error message? Any input would be helpful, thanks