I used KMCgui to create a KMC wallet and then backed up the KMC.wallet file. But when I reset my PC the wallet address changed. I do not see my coin. Please help me! Thank you!

I used KMCGUI to create wallet. Then, I backed up my wallet and reset my PC. But when I restore my the wallet address has changed. I do not see my money. Please help me. Thank you!