trados sp2 can't open excel file

now i am using trados studio sp2 and office 365, and when i want to translate an excel file, i always get an error message, as follows:

if i open a .xlsx file, the error message is "the file was not created by supported version of Microsoft Excel application and will not be processed."

if i open a  ..xls file, the error message is "Microsoft Office 2003 or later must be installed for processing XLS files."

i used office 2010 in the past and it works, i wonder how to solve this problem now.

thank you!