I HAVE BEEN USING SPSS IN CLASSROM, BUT NOW USING HOME FREE TRIAL. I am getting started, but when I try to enter a variable name I keep getting a message saying "maximum number of variables exceeded" but it is just the first variable
Please have a look at this technote:
Maximum Number of Variables Exceeded Error in IBM SPSS Statistics
If you have SPSS 23 then download and install the last fixpack for this release.