I downloaded the bitcoin wallet from bitcoin.org and installed it with not issues on my windows 7 machne now ive been syncing for the past few days and i just got a popup which said my database got corrupted i have tried rebooting my machine and following some tips onlne and made sure i installed correctly but it pops up with that message every time i get close to 21 weeks left is there any reason for this? is it a common error and how can i fix this

its really annoying becase i want to use the bitcoin wallet because its the main one but i might have to move onto multibit or some other client.