I have windows vista and I am having a problem in opening any kind of programs like microsoft office, command prompt, calculator, notpad ... Every time I tried to open them it will come back with "Choose a program you want to open with". I never have this problem before. Any help, please.
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Seems to be infected with some kind of trojans/malware. Boot inro safemode with networking. Download & install Malwarebytes & run a scan! Remove the threats find! Restart & try!