Since posting earlier problems (drive k: etc), i have given up my efforts
as i did not succeed in my attempts.
as a temporary measure, i open the system in safe mode with internet
options. now i can open new word/excel documents, type on them but
the documents/sheets could not be save - some message comes saying
want of space/delete records, etc. Also, the existing files could not be
opened - read only problem.
if the above problems are addressed/solved, i will be relieved of the
worries to certain extent.
looking forward to your valuable guidance.