i am not able to install sone softwares on vista as they are not working properly,
for example some games like "counter strike" and "hitman" are not working on my notebook.
moreover softwares like internet download manager is also not working properly.
plz help me with some solutions...
Microsoft Vista is still within it's infancy. Meaning it still has many conflict/compatibility issues.
One alternative you may find useful would be to downgrade your Dell Inspiron 1525 to Windows XP.
You can learn how here: http://www.pocket-sized.co.uk/how-to/19/downgrading-dell-inspiron-1525-windows-xp
hardware acceleration is either disabled or not supported by your video card driver, which could slow game performance. make sure you have the latest video card driver installed and that hardware acceleration is turned on.