I dont have graphic card in my computer. can i

You must have a graphic card or you couldn't see anything! Right click on the Desktop>Properties and you should be able to find out what the adaptor is.

you can instal windows vista on any PC with atleast 512 MB ram. you will surely get the performance. but you wont get all the looks and effects like aero and windows tranparency without a pretty graphics card.
but you can download lightwieght third party applications like glass2k and winflip3d and many more like y'z shadow to get all the effects.
these applications dont use much memory
and still you will get all the effects.