Dell Inspiron 1545 Gaming Notebook

Intel Core 2 Duo T6400 2.0ghz 2Mb L2 Cache, 800Mhz
Genuine Windows Vista® Home Basic SP1 32-Bit
2Gb DDR2 SDRAM
250Gb SATA Hard Drive
DVDRw Optical Drive
ATI Readon HD4330 Graphics 512Mb Hypermemory
Bluetooth/Wirless
15.6WXGA 1366x768 TFT Display, Built In Webcam
1Year Dell Onsite Warranty

My Price: 2250Rm

May i know how long the battery last?Is the anti-virus software already installed in it?