HELP - Forget my downloading tasks

I have the following problem: When I exit Bitcomet - ver.1.15 stable version, and then reopen to re-start the downloading of the torrents, all the downloading tasks and completed files are deleted and the task page is empty

My PC uses:

Vista Home Premium

connection ADSL with router Belkin N1

antivirus ESET NOD32

Any help in solving this problem?

Thank you

paul

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