Depending on the age of the laptop it can gather a lot of dust. If that laptop is over a Year old then Take a Compress air Can to remove the dust form the vents. If there is too much dust then you should take it in to get it cleaned by a computer tech.
Another cause is that you have way too many programs running. You did forgot to mention the operating System. Is it Vista or 7? IS it a 32 or 64 bit OS?
IS the Side bar running? If it is then disable it.
Also go to Start then on the Search bar type MSCONFIG. Go to
SERVACES. As a side note this is I have disabled on my own Laptop.
Disable: Ready Boost (With 4 gigs of RAM you do not need it)
Windows card space
Anything with the word REMOTE it the title
Smart Card and Smart Card Removal Policy (Unless you use them)
Tablet PC input Service
Windows live ID Sigh-in Assistant
Windows Media player network Sharing Service
Parental Controls (Unless you have kids)
Altiris Deployment Agent (If you do not have this do not worry)
Windows Media Center Receiver, scheduler, Service launcher
Google Desktop Manager and Update. (Unless you use Chorme and Earth. Then Leave Updater alone)
I started having my laptop freze up on me the other night. I tried CTRL Alt Del but it did not work. I had to hold the power button to shut it off.. I turned the laptop back on and after awhile it happened again. I called Toshiba teck support and the guy told me to do a factory restore, I did this and I am still having my computer lock up on me...What might be causing this to happen? My Laptop is a Toshiba Qosmio 870. It has intel core i7,4 Gigs of ram, 500 harddrive, NVIDA 360 Graphics.... Thanks for any help!!! Paul