You can reinstall it if you reformat your c drive and reinastall everyhting or if you make a new drive by partitioning one off and reinstaling stuff on that new drive. Of course if a puter has never had it installed before and has no registry entry from it none of that would be necessary. You might also try setting back the clock, I have no idea if that would actually work or not, but it worked on a demo version of paint shop pro that I had before to use it after the 30 days expired.