Windows 7: Can't read from the source file or disk.

i get this problem in few of my files in hard disk, which is Disk D, first one is Disk C, any1 have cure for this, at first i only have this error in 1 file, now in 3 files, but these files are working perfectly, just cant copy paste.

What are the file extensions of the files in question? Also why do want to "copy and paste" if you want to save a opy of the file in another directory just drag with the right button and choose copy!

^
i have 2 files i think those are .avi, movie files, and 1 is .gami file, which is used in san andreas game.

also, i have an external hard disk for back up of all my files in drive D:, so whatever update i make in my hard disk D:,. i also update my external hard disk.., but copying file failed.

in the screenshot, im attempting to copy paste that file into a 2 gig flashdisk, but failed.

OK If you haven't got the "Take ownership" facility on your PC then go to this:
Take Ownership Shortcut
and install it. When installed, right click on one of the files in question and in the window that opens click "Take Ownership"
See if you can copy then.

this didn't work, btw~ is there any possibility that my other hard disk is locked, or blocked from copy paste of files, btw~ i tried copying small size files, they work, but 100mb+ error comes.

EDIT: ignore my question, i guess some of my files only are locked, not the whole hard disk.

I still can't see why you dont just drag and drop!

drag and drop, same error.

I had this same problem myself, I've got some 4+Gb matroska movie files on a USB-HDD Portable and copying or Drag n Dropping to the PC wasn't working. I was getting the same error message as OP. I'm running Windows 7 64Bit and the USB-HDD is also NTFS.

Is your external HDD solely powered by USB? Usually when that is the case it doesnt always get enough power, try with one of those double ended USB leads, that's what worked for me.

What a good bit of thinking! Certainly makes a lot of sense. I can't say i have seen an Ext HD without it's own power supply but I'm sure they exist!

Well it's one of these babies for instance:

iomega Prestige Portable HDD