Metatrader problems on windows me

 
Hi, I've got metatrader on a computer with windows Me and I'm trying to do a backtest and the EA only makes one or two trades over any period. Over the same periods, the same EA on XP does around 20 trades. The history is 90% on both computers. Why will the metatrader on windows Me only do 2 trades max??
 
It is no enouph datum about problem.
What is a file system on both computers? (FAT or NTFS).
What is period to backtest (from ... and to ...)
What is time-frame, modelling and other questions?
Reason: