So after I download the assembler with nasm-2.11.08-installer.exe, I get all the files required to use the assembler. Among files and folders, you'll see uninstall.exe . So, yesterday I downloaded everything to my desktop and I wanted to uninstall the assembler and redownload. So, I clicked uninstall.exe , and chunk of my files and folders went missing suddenly and never appeared back. I was really surprised. Some of the files were important to me. I did system restore and some came back, but most of the important ones didn't. Is there anyway I can restore everything fully? Has anyone experienced same problem as I did? I would appreciate anyone's advice!! Thank you!