Kernel.32 and <unkown.dll> error

One of my fellow techs at work tried to uninstall a novell client from a windows 98 computer at work.Now every time you right click on anything and ask for properties it gets an Kernel32 error or unkown dll error.Tried a re install over windows didn’t work.Is there any way to fix this without totally having to delete windows or formating.Customer has very important files on computer and cant loose his lotus notes program because he lost disk.Also tcp/ip ans networking dont work anymore either.