It could be the malware not allowing the download or the install. Please go to filehippo.com. On their page look for the red bar that reads Antimalware and click on that, then download from there. Before install change the name of MBAM to something like new.exe, then install. I'm hoping Matan was right in the file corruption, though, but just in case you're in it deep use the suggestions above...gwb56