I also had the same problem. I have the A6200 laptop.The msi recovery on the hard drive failed with "reagentc.exe false" error. Same thing with the recovery dvd i had created earlier. same thing with the recovery dvd that bought from MSI. I tried installing Win7 from a installation dvd which failed as well. Then i ran a memtest86 and found out that one of the memory sticks was bad. you could also run the memory diagnostic on the Windows Recovery DVD (WRE) as well. So i just took out the bad memory and the MSI recovery worked flawlessly. I wish i had realized that this was due to bad ram. i wasted money buying a new recovery dvd from msi and wasted days trying to fix this. So if you are getting the reagentc.exe error check your memory. I am not saying this is the only source of the problem, but it could be and i haven't come across anyone suggesting this anywhere else. Also the reason i decided to do a clean install in the first place was because windows kept crashing randomly, which should have made me realize that this was a memory related issue. I hope this helps.
It took me about 30-40 minutes after i took out the bad memory. I left it running for 700 hrs before i knew that the problem was the ram lol.