Hello My computer was infected by the "windows recovery " virus/malware when running Firefox 4 with administrator right user . I could get rid of the virus/malware using antivirus and antimalware sw ( superantispyware, antimalwarebytes, spybot and avast ) . Currently , no viruses or malwares are reporetd on my system . Still, when starting firefox.exe , the error message " firefox has encountered a problem and needs to close " is triggered and , although firefox starts and runs OK; it will close whenever a send/don't send option is taken on the error message . If I rename the Firefox.ex exe program into another name, Firefox runs OK and the error message is not triggered . I have had superantispyware support run an analysis tool on my system and their feedback was that the infection, if any, can only be viral . I had AVAST run in F8 safe mode and no viruses are reported any longer after desinfection of the system where a couple of exes created by the malware were found/deleted . I tried uninstall/reinstall Firefox 4 and 3, but the problem remains . Also, I have looked for a crash report in the documents and settings folder but finds none . Last, I also tried to start firefox.exe in safe mode but it will not start ( it will well start if I rename firefox.exe into another name ) Thanks beforehand if you can suggest something to solve this . Best regards Pierre W