The Logic Off Topic list

hallo everyone, sorry for my english but i am italian.
the question is:
when i want to merge some files in an audio track logic don start 
merging and send me this message: small memory (errore code 158 or 138 
sorry but i don.t understand wery well the number).
I have 1Ghz of memory Ram\333, win 2k , amd 24oo, asus a7v333, and 
audiowerk8 soundcard. I use vst instruments like stylus and more.
Please help me