This can have several reasons
- you need to have write access to the location where your database is created
- your harddisc needs to have space for it
The computer brand and version is not so important, but the OS (windows or Mac or Linux) and in windows how did you install? In windows, easiest is to use the zip archive version, and extract it in your user directory on the computer. Then you should have write access to the default database location (which is in a subdirectory of your user in windows, check other posts here).
And check if your harddisc is full, and if yes, make some room.
Good luck!
Andreas