Hi Michelle,
The robot.txt validator I am using is showing a series or errors all more or less the same as this;
ERROR Invalid Line:
<!doc type html public "-//W3C//DTD HTML 4.01 transitional// EN">
I did not build the site myself and have no coding experience whatsoever. However I've learnt a lot over the last couple of months and have found some things that concern me about our site a little. I am convinced that the SE are having trouble reading the pages, although I know that this could be due to an inherent problem with osCommerce, it might also be this.
Any help with clarification is greatly appreciated, thanks C.