|If the hard drive passes the hard drive manufacturer's own diagnostics, there's nothing wrong with it.|
"It is 2 years old and used 7 days a week aprox 10 hours a day"
The hard drive I am using on this computer that I am acceesing this topic with, a 3.5" Maxtor 13.66gb that had a 3 year warranty, has been used nearly every day since the beginning of 2000, fewer days at first, more as time went on and I wasn't working as much, and for the last four or more years often for at least 6 hours a day. It has rarely been run more than 12 hours in a row and never 24/7. I Shut Down the computer and switch off it's AC power source on a power bar/anti-power spike/power surge device whenever I'm not going to be using it for at least a few hours, and have rarely let it run all night.
I've never heard of a problem like yours being caused by anything in Windows itself.
Try running sfc (system file checker). I'm assumimg it will run on your laptop if it still has it's original IBM/Lenovo software
installation on it without you needing to insert a Windows CD or the equivalent.
Start - Run - type: sfc (click OK or press Enter). It takes up to a half hour so to complete. You will priobably see no messagesabout what it did.
Reboot the computer when it's finished and see if you still have the same problem.
If you do.....
You could try running what many call a Repair install (of XP) procedure (I prefer to call it a Repair Setup procedure - Windows has never been installed by using an Install program), but doing that may not fix your problem.
An XP Repair Setup will (almost always) not harm your existing Windows installation, but it can only fix things Windows detects as wrong, and/or replace corrupted or missing Windows files that are on your original XP CD, or the equivalent.
If running it doesn't help, you would be wise to back up the data you don't want to lose on C that cannot be installed again, then you run the Recovery procedure for your model, and then restore the things you saved to the laptop again.
You will need a regular XP CD of the same version, Pro, or Home (if you have XP MCE, you would need the OEM TWO CD set), or the equivalent, or a bootable copy of one preferably on a CD-R,
OR the equivalent - a Recovery CD that came with your model from which you can run Windows Setup, or a Recovery CD that you have made or can make now by using an IBM or Lenovo supplied program already in your Programs list that makes one that can do the same thing with,
AND you need the Product Key for it - usually that's on the official Microsoft label on the outside of your case if you're still using the same XP version - Home, Pro, or MCE - that the computer came with, it's often on the bottom on a laptop,
OR - if you don't have that, or have loaded an XP version that was not on your laptop originally - Home, Pro, or MCE - if you don't know the Product Key, you need to use a program that will find it BEFORE you run the "Repair install" (Repair Setup) procedure, such as the freeware Keyfinder, by Jellybean whatever (it also finds other Microsoft software Keys).
(AND/OR there may be info on the Lenovo web site for how to Repair your operating system without losing the data on C, and for how to make a Recovery CD or Recovery CD set).
How to do an XP Repair Setup, step by step:
Usually a Repair install (Repair Setup) procedure completes successfully, BUT....
It is VERY important that you have no problems reading from the CD, and that your ram is working fine, while you run the procedure. If the procedure can't make it to end of Setup, you may have a Windows installation that cannot be fixed without using a Recovery CD to restore the original contents of C.
Make sure the CD is clean.
Use a laser lens cleaning CD in the drive, or if the laser lens is obvious when the tray is ejected, clean it with a tissue or cloth or a Q-tip, or similar, BEFORE you run the procedure.
See response 2 in this - clean the contacts on the ram modules, and make sure the modules are properly seated:
For a laptop, you must remove both its main battery and AC adapter before you do that.
See your Owner's or User's manual for your model if you need to, BEFORE you remove the ram.
If you have not already done so, make at least the single Recovery CD, if your computer did not come with one, that can be used along with the intact contents of your Recovery partition to restore the original contents of C, or better still, make both that and a Recovery CD set, by using an IBM or Lenovo supplied program already in your Programs list to do that.
If you have any data you don't want to lose that cannot be installed again, back it up - copy it to (a) CD(s) or (a) DVD(s) or (a) flash drive(s), or an external drive. For some programs such as Outlook, you have to make files that the program can recover your settings (and saved email in that case) from later.