I am not sure why you got that error, but here are the things you may try:
- Make sure your system is virus free
- Try to temporary disable any antivirus before running the unit1.exe
- Check if the file exists: "c:\fpc\3.0.2\file\*.*"
- Restart your Windows to safe mode and run that unit1.exe
- Test the program again but using other version of Lazarus (maybe 1.6.2)