Card Images Become "Unopenable" on Notebook After Changing View From "Details" to "Medium Icons"

Question

I've been viewing & placing image files into folders directly from my camera card over the past few days on my new notebook. It was becoming very tedious as I had to view each image seperately to see what it was, before I had the bright idea to try to "VIEW" them differently. In the process of changing the "VIEW" from "DETAILS" to "MEDIUM ICONS", some of the the pictures which had previously been fine the few times I had taken the card in & out of the notebook, became HP Icons instead of the picture's thumbnail. I didn't realize this at first because the pictures were broken up into months (luckily), I  was going through them chronilogically, and it wasn't until I got to images from the 26th of that month that I came across this problem. I clicked the HP logo for these images and got the message "SORRY, WE CANNOT OPEN THIS PHOTO". I immediately panicked and closed the folders and took the card out to put back into my camera to see if it showed up on there. Sure enough where those images had been was replaced with a big question mark and the message "Unidentified Image" when I selected it to view. I immediately went through every picture on the camera to see if this had happened to images from other months, but it had not. I had no clue what had caused this as all the images on the card/camera had remained intact the previous times I had put the card in the notebook (I'm constantly viewing images on the camera & usually go through all of them in passing daily). I had no idea what had caused this, and was afraid to put the card back into the notebook. After trying to explain this on some camera forums I needed to know the exact messages I received trying to view those images. Put the card in, took it out, and no more pictures were effected. A day passed and I figured I could work on filing pictures from the other months until I could solve the problem. I went through the camera first, and all the other images were fine. Put the card in and was presented with the "DETAILS" view again, so I changed it from that to "MEDIUM ICONS". MISTAKE. BIG MISTAKE. The same thing happened to several pictures from that file, which I immediately saw, closed the file, and took the card out. The images which had been fine moments before were now question marks on my camera. Genius that  I am had to do it twice to figure out what did it. After that I tried changing the view back to "DETAILS", which of course didn't work.Prior to that I didn't think it was the camera, but I wasn't sure if it was the card or the notebook. I've had the camera 3 years, no problem. I've had the card 6 months, no problem. I've only had the notebook a few weeks, and had only started using the card reader a few days before this happened. Any help would be greatly appreciated as most of the pictures effected were irreplacable Christmas pictures.
Just in case it helps my camera is a Canon PowerShot SX150 IS and the card is Wintec filemate Professional Plus 64GB.

Answer 1

Thank you for responding,
                                                      I have tried copying the affected images after they began to display the problem, but they opened (or rather didn't) the same as before I copied them.
I was using the default program to view the pictures, HP Connected Photo. However after this occurred I attempted to view them with Windows Photo viewer, with the same result.
Unfortunately I do not have an external card (but if i knew it would restore the photos I would definitely get one).
I don't think I have a virus, and the notebook is still so new I have the trial of McAfee running (which, for what it's worth, says "Your computer is secure". My internet service is also protected.
As stated I was copying images from the card for several days (and taking the card out & inserting it back into my camera after each use) with no altered images showing up either on the camera or the notebook. It wasn't until I changed the way I was viewing the files from details to thumbnails (medium icons) that some of the images from that file were affected. (The pictures had automatically been seperated into files by month, so there were 6 files. Only the file with the thumbnails I switched how I was viewing had altered images. The other 5 files remained fine, until I did the same with November's file, at which time some of those images became unviewable as well).