System Requirements
| Minimum | Recommended | |
| CPU | 1.33 GHz | 3.3 GHz |
| Memory | 512 Mb | 2GB |
| Hard Drive | 100 MB Free | 1 Gb free |
| Internet | Not Required1 | 100 Mbit/s |
| CD/DVD | CD reader | DVD read/write |
| Monitor | 1280 x 1024 resolution2
8 bit colour |
1280 x 1024 resolution,
32 bit Colour |
| OS | Windows 2000, SP2 | Windows XP3 , Win 7 |
| MS Office | Not Required4 | Office 2000, 2002, 2003, 2007 |
1 Internet connection is highly recommended but not essential. Internet connection is convenient for email alerts, product activation, upgrades and remote technical assistance.
2 OhNo! was designed to run at this resolution. It will run at lower resolutions with full display accessed via scroll bars.
3 Vista compatible.
4 OhNo! does not require MS Office but some features do not work without it (email and task alarms, exporting files and batch formulary)