Welcome to TSF:
Here is a link to an outstanding (5 stars) PROVEN partition repiar prog / not free ~~ but the best if your data is critically important to you ~~ and you can scan your drive and it will tell you if the recovery will be forth coming or not !!
http://www.ptdd.com/
here is another / this one is free (2 stars) / this prog also has been reported to be a good one / although doesnt seem to be anywhere near an equal to the above
http://www.pcinspector.de/file_recovery/UK/welcome.htm
another free one / havent heard as much feedback on this one yet / so if you choose please let us know
http://www.easeus.com/
As for the why's of the reoccurence of this problem / I am not sure could me many things like ~~ a quirky OS install / flaky partitioning etc
after you have recovered & backed-up your data I would strongly suggest you run the hard drive manufacturer's diagnostic utility off their website to be sure the drive is healthy / then if it were me / I would use a drive eraser (zero fill pog / and do a clean install of the OS / two occurences of messed up partitions would remove all my trust from the existing OS install and drive me to a "fresh" start ~~ but thats just me - i have no patience for a flaky OS or machine
let us know how you progress / dont hesitate to ask more questions when needed
regards
joe
Here is a link to an outstanding (5 stars) PROVEN partition repiar prog / not free ~~ but the best if your data is critically important to you ~~ and you can scan your drive and it will tell you if the recovery will be forth coming or not !!
http://www.ptdd.com/
here is another / this one is free (2 stars) / this prog also has been reported to be a good one / although doesnt seem to be anywhere near an equal to the above
http://www.pcinspector.de/file_recovery/UK/welcome.htm
another free one / havent heard as much feedback on this one yet / so if you choose please let us know
http://www.easeus.com/
As for the why's of the reoccurence of this problem / I am not sure could me many things like ~~ a quirky OS install / flaky partitioning etc
after you have recovered & backed-up your data I would strongly suggest you run the hard drive manufacturer's diagnostic utility off their website to be sure the drive is healthy / then if it were me / I would use a drive eraser (zero fill pog / and do a clean install of the OS / two occurences of messed up partitions would remove all my trust from the existing OS install and drive me to a "fresh" start ~~ but thats just me - i have no patience for a flaky OS or machine
let us know how you progress / dont hesitate to ask more questions when needed
regards
joe