The game is unable to run correctly without a gaming quality video graphics card, per the system requirements. The GT 520 is only an entry level (business quality) card. It's not possible to upgrade a laptop or an all-in-one, however, your system may work to a greater extent than it is now, if you reduce graphics settings to a much lower level (it defaulted with your card to "Medium" setting because the card isn't in its internal database).
Minimum:
OS: Windows XP 32-bit with SP3
OS: Windows Vista 32-bit with SP2
OS: Windows 7 64-bit
CPU: Intel Core 2 Duo (or equivalent) running at 1.8 GHz or greater
CPU: AMD Athlon 64 X2 (or equivalent) running at 1.8 GHz or greater
RAM: 1 GB (1.5 GB Vista and Windows 7)
Video: Radeon HD 2600 Pro 256 MB (should be 2600 XT or X1800 GTO)
Video: NVIDIA GeForce 7900 GS 256 MB cards (unless this should be 7800 GS)
Disc Drive: DVD ROM drive required
Hard Drive: 7 GB
Sound: Direct X 9.0c Compatible Sound Card Windows Experience Index: 4.5
