Emergency

I'm sorry this is an Authors not and I'd appreciate it if you read this. My computer was infected with spyware saturday it was fixed by sunday. Well when I went to intall my Microsoft Word program it could not, because of a corrupt fie. Does anyone know what I can do, or do I have to buy a new program? Please review with your suggestions, or send me a message what ever is easier. Thank you all so much for your help.