Try PhotoRescue. It's very good and I'm sure will do the job.

I've used PhotoRescue as well and have only good things to say.  One particular benefit is that you can download and try to recover without paying anything.  If it's able to recover files, then you can buy a license and continue the process.

If your card is from Sandisk, they have a free recovery program which works well, but I also tried RescuePro and that works well too.

I confirm that PhotoRescue works well.

I feel this a must thus buy it and write it down against your business--- I have recovered other folks data and charged them over a few $100 usd thus another way to make money...

Hi there,

I ended up using a free software a friend suggested, named ZAR.

But now my PC is out of service. First clue not turning on once during the week, then on Friday it had a sort of "explosion" sound while turning on. Oh, well, it seems electronics are working against me lately.

Anyway, with the software I was able to restore most of Thursday's shots and perhaps 50-60% of Friday's (the day the mem card failed). There were some curious "recovered" files with a mix of two shots from different days.

Perhaps the options suggested here woud offer a better result, maybe even the full recovery, and I might have tried them if the images were really unique, but that wasn't the case, although I regret having lost some photos of the cloudy weather. With that in mind, the free software did a reasonably good job.

It is curious that date/hour are preserved in the files' EXIF data, but the recovered files show the date/hour of the time they were recovered. I wonder if it is the same in these paid softwares? This was not a big issue, the files for each day were still in the original order, just wrong date/hour.

Get a new card for 20 dollar, instead of using a risky card and get into trouble again. If the card failed, and then is rejected by the camera after formatting it, something is telling you to get rid of the card and get a new one.

A decent card doesn't cost US$20 here, unfortunately. 

Had I managed formatting the card, I wouldn't use it as a main card, but as an option should the other two cards run full.

I throw mine out (or send back to mfgr).  No use in keeping risk in my camera bag if I was able to reformat it.  I sent it to San Disk and they sent me a new one.  I have five cards and I even get nervous with that few when I have one in my underwater set up, one in my topside set up and three spares.  The ones I own are not $20 US either.  Mine I think were $120 ish, 64gig 95 mbs.  In fact I am going to buy another one right now. Also, I change my card after a day of use, but if I nail a winner, especially underwater, I remove the card after the dive and stick in a new one.  I have had too many card failures to trust them with a hard to get shot and keep piling more shots on top of that one image I have high hopes for.  Here's a recent example. I shot this a week ago.  Came up and removed the card because getting that fish within inches of my dome was a one shot deal.

I had a problem with a Lexar card recently. I accidentally deleted the photos from the card before importing them. The accident was caused by too much multitasking: importing pictures, making dinner, feeding the dog, watching the baseball game on TV, the usual kinds of things - there may also have been copious quantities of beer involved.

I called Lexar's customer service number, explained my problem and the nice people there helped me recover everything. They emailed me their Image Rescue program and stayed on the line while I installed it then walked me through running it. I got everything back I had lost. Image Rescue even found some older files that I had finished with months earlier.

ETA: I like that advice about replacing faulty cards although that wasn't my particular problem.

I also keep some of my old memory cards for various offline uses. One contains several different jpegs for printing photo business cards (I use Lightroom & Photoshop to put 10 cards on an 8x10 print). Another contains PDF model releases. I keep them in the glovebox in the car so when I need more they're handy.

I've used photorec aka photorescue with excellent results.  Once recovered over 10,000 images for a fellow photographer.

A decent card doesn't cost US$20 here, unfortunately. 

Agree with that. DONT spend $20 on a new card spend at least $50 (or $100 for a faster one) on a well known brand - more importantly buy it from a known reputable domestic retailer - not someone selling knock offs on ebay. I once had a completely perfect in every way (holograms, packaging, instruction manual etc) sandisk card that turned out to be a fake when I tried to return it. Only the missing serial number that should have been stamped on the edge was the giveaway that I was (probably) a quality control reject that somehow escaped the factory.

Your data is far too precious and your time far too valuable to be messing about with cards that occasionally cause problems, the time spent just recovering one load of data will pay the price difference.