Probs with dc-pc serial cable

[Dalsapav]

I'm having some problems with my serial cable...I get the files to send but when i get to a large iso in the middle of the iso i get garbage on the screen...I have tried the ramboost idea and still no prevail...i ##### my ram and i have 256mb PC100 ram and always atleast 128mb free i even set ramboost so that if it goes under 64mb it optimizes it over 128mb...still nothing works...then i have tried to turn all things off running in the backround by running msconfig and turning everything that runs on the startup...I still cant get anything to work...If it is a dc game with more than 1 track i can usually get all the tracks but the last one which is an iso and usually the biggest file...can anybody help me?