There's always a reason why they lock up. Sometimes it just isn't apparent what that reason is.
First question, what version of WIndows? Have you installed all of the Windows Updates and Service Packs? Have you run chkdsk/r lately? Open a command prompt and type chkdsk/r then hit enter. Anser Y when it asks if you want to run it the next time you start windows, then reboot the laptop. This will take anywhere from 15 minutes to a couple of hours depending on what it finds that needs to be corrected.
To check the ram you need to download the Memtest CD Iso, create the CD using the Burn From Image option, then boot to it and allow it to run through a minimum of 3 complete passes. If it shows ANY errors whatsoever then you have defective ram.
To test the hard drive determine what brand of hard drive you have. You can check the Bios/Setup to find out or run SIW or Belarc Advisor. Go to that manufacturer's support site and download their Self Booting Diagnostic CD ISO image, create the CD using the Burn From Image option (see http://iso.snoekonline.com/iso.htm for more information on doing this), then boot to it and run the most exhaustive tests available. If you have a Toshiba or a Hitachi hard drive you will NOT be able to test it as the Hitachi DFT will not run on the Intel ICH9M chipset in your system and Toshiba won't supply a diagnostic test to the public for their drives (which is why I avoid them like the plague).
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If you don't post your COMPLETE model number it's very difficult to assist you. Please try to post in complete sentences with punctuation, capitals, and correct spelling. Toshiba does NOT provide any direct support in these forums. All support is User to User in their spare time.
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