i am new also but this is what i know. if i am wrong someone let me know.
first i have 8.1 on my main box and have never had this problem but i do have the dev that you mention. i have no idea what it does. but i do know that i had a problem with an error i got ever night at the same time and it turned out to be something in my cron scripts. this is what linux uses to do tasks daily, weekly, hourly, etc. you may want to see if that is your problem.
on the part with world write files what are you using to detect that?
i know you do not have a viris if you have not done anything silly like use third party software as root? everything else is speculation.
make sure that you know every program that mandrake put on your system. there are alot of bells on and there may be things you did not know of and dont want.