I recently bought a Dell vostro 1520. The configuration is: -Intel® Core™ 2 Duo T6670 w/VT (2.1GHz, 2MB L2, 800MHz FSB) -Genuine Windows® 7 Professional, with Media, 32-bit, English -4GB Shared Dual Channel DDR2 SDRAM at 800MHz, 2 DIMM -Intel® Integrated Graphics Media Accelerator 4500MHD -500GB 7200RPM SATA Hard Drive with Free Fall Sensor After a few upgrades, Windows7 started giving me trouble. After using system restore 3-4 times, when the problems didnt stop, I formatted my hard drive. Now I am trying to install Windows xp on my laptop, but it gives an error "bootmgr.exe is missing". Kindly help me to install windows xp.