Two computers in same office hanging on Chkdsk

I have two computers in one office that are hanging on Chkdsk at "Clean Disk".   To get off this screen I need to hard reboot which brings up chkdsk again.  What would cause two different computers running Windows 7 to do this within the same week?   I have not even seen this happen on a single computer let alone 2 in the same week in the same office.   Any ideas?
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JohnBusiness Consultant (Owner)Commented:
Users perhaps got a root kit virus that has done some damage?

Run Hardware checks on both computers (use the Manufacturer's test program). The two computers could have the same batch of hard drives.

Get memtest86.exe and run memory tests on both machines.

It could also be simply coincidence.

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RaminTechnical AdvisorCommented:
If they are Desktop PCs then you can also detach the Hard Disks and attach them to a PC with Windows 7 operating System.
Run CHKDSK X: /F, where X is the letter assigned to your external HDD.
David Johnson, CDCommented:
There could have been a power failure or other event that damaged the disks. Put the drives in another computer and test with the manufacturers disk test tools
depending on what didk model they have, you can run the ma,nufacturers diagnostics frim the UBCD - or not
so post the drive model please
Hardware diagnostic CD    UBCD
go to the download page, scroll down to the mirror section, and  click on a mirror to start the download
Download the UBCD and make the cd   <<==on a WORKING PC, and boot the problem PC from it
Here 2 links, one to the general site, and a direct link to the download

since the downloaded file is an ISO file, eg ubcd527.iso - so you need to use an ISO burning tool
if you don't have that software, install cdburnerXP :

If you want also the Ram tested - run memtest86+ at least 1 full pass,  - you should have NO errors!
direct download :
For disk Diagnostics run the disk diag for your disk brand (eg seagate diag for seagate drive)  from the HDD section -  long or advanced diag !  (runs at least for30 minutes)      

**  you can make a bootable cd - or bootable usb stick
*** note *** for SSD drives  use the tool from the manufacturer, like intel 's toolbox :

for completeness -here's how i handle disk problems :

==>>****in order to be able to  boot from CD or usb - you may have to disable secure boot in the bios
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