There is a tool called Pywallet that you could try. I am not sure if it can find Multibit wallet files because I think it's only meant to find Bitcoin Core wallets. Another option is Findwallet.
I just re-visit
https://github.com/jackjack-jj/pywallet and
https://github.com/KingZee/findwallet, but it's clear both tools only meant to find wallet file generated by Bitcoin Core.
Good suggestion, although i would recommend OP to make RAW copy of his hard drive first. There's possibility his MultiBit wallet file was deleted and could be overwritten if he accidentally do something that perform write on the hard drive.
To OP and other reader, i recommend you to write RAW copy of your hard drive using tool such as
HDD Raw Copy Tool. Make sure you keep the copy on different storage drive.