|"I did some changes in BIOS but did not work"|
Why did you mess with the BIOS & what did you change?
The Ti200 is an old card & seeing as how you only have 512MB RAM, you probably have a fairly old system. 512MB is barely enough to run XP, 1GB should be considered the minimum for reasonably good performance.
Make sure you've installed the motherboard chipset drivers 1st, then install the graphics drivers. Here's the graphics driver you should be using: