my windows 7 resolution change to 800*640 when i go to windows xp and come back to seven 


My Computer
- Computer Manufacturer/Model Number
- Intel
- OS
- Windows 7
- CPU
- Intel Celeron 2.54 MHZ
- Motherboard
- Gigabyte
- Memory
- 1 GB
- Graphics Card(s)
- 128 MB
- Sound Card
- Realtek AC97
- Monitor(s) Displays
- Samsung syncmaster 933sn
- Hard Drives
- 500 GB Seagate
- Case
- 512 KB