Reading complex textfile (scanFile?)

Hi

I have measurement data in large (60MB) txtfiles, with headerrow and mixed numbers and strings (and sometimes strings such as ERROR in the place of where i want to load numbers).

What is best way to do this? I need to skip first row, then from the other row (columns separated by ':' which doesnt seem to work for matlab scanFile). I only need to save around 5 out of 30 column data from each row and want to be able to investigate the data of a certain slot before deciding where to store it (if ERROR is in the place of a measurment number for example). A could use fgets() to load a line by line and then try to extract data for the line at position 6,11,22 etc but this will be slow with 100 000 lines...

Thanks a lot Erik