Automatic update causes loss and corruption of files on the flash usb drive

I have this problem: I have installed on my kingstone 1Gb USB flashdrive the following portable app: portable open office, clamwin, firefox,thunderbird, gaim, 7-zip, VLC, all portable and downloaded from portableapps.com. All of them were running fine until the time thunderbird asked for a update from the Internet. After that the update was downloaded and I restarted the program. A window opened up and tell about the progress of update. This happened in two time with the same result: data loss and corruption of all my data on the flash drive:

First time: the update was sucessful but I lost all my e-mails and data from openoffice

Second time: the update was taking too long to finish and I stop it by task manager. Them I lost all my e-mail, corrupted all my personal data and couldn´t run any of the other programs on the flash drive. Now I´m installing all that stuff again and asking what to do to avoid this problem? I tried to uncheck the option on update but the program did not aloud.