Window well covers??

Hi, So I have this bay window in my new home that clearly had some damage when we bought the place - there was a rotted section that they had stuffed dryer sheets into and then covered with duct tape. We pulled out most of the rotted part today. There's some sort of metal flashing tucked under it that seems to have done more harm than good - it looks like water was getting in there and rotting the bottom of the sill. The metal itself is also pretty damaged. I'm just wondering if anyone has any suggestions about how to fix this properly. [ATTACH]96037[/ATTACH] [ATTACH]96041[/ATTACH] Thanks in advance ETA: we haven't seen any sign of water coming in during rain storms since we bought the house. The previous owners seem to have applied some sort of tape/flashing around the underside of the window - don't know if that fixed it.

Hello I'm trying to get some info on if I should replace the framing around my bsmt windows while I replace the windows also. I'm installing a new bsmt bathroom and have two windows that I would like to replace cause they are old and I want sliders. I am looking for advice as to the difficulty on replacing them along with the wood framing that's around it that's getting rotted from the outside as well. Is it something a diy can do. Any information would be great and helpful. Have pics comming Thank you