I unable to open any ms office word and excel files, its showing files are corrupted.

Hi,

Does it only happen to Word and Excel? What about other Office applications, like PowerPoint?

Please first try to launch Word and Excel in safe mode: Press Win + R and type "winword /safe" or "Excel /safe"in the blank box, then press Enter.

Click File->Open to open the file and check result, this will help to determine if any add-ins caused the issue.

You might want to repair your Office from Control Panel, the installation might be corrupted. For steps on how to do this, please check this article: http://office.microsoft.com/en-us/outlook-help/repair-office-programs-HA010357402.aspx

Hope this helps, please feel free to post back.

Thanks,

Ethan Hua CHN
TechNet Community Support