When I try to open streets.ship file from the exercise data file downloaded for working in the Quantum GIS Training Manual, I get an error message: Invalid Data Source C:/Users/new user/Documents/streets.ship is not a valid or recognized data source. What am I doing wrong?
A shapefile consists of (at least) three files. In your case streets.shp, streets.dbf and streets.shx. These files should al reside in the same folder. If one of them is missing, the error message "streets.shp is not a valid or recognized data source" will appear.
Also, make sure the zip file doesn't contain any "children" folders i.e. when you open the zip file you will have (at least three) the .shp, .dbf, .shx files with no parent folder above or below.