I was reinstalling windows 7 but after first restsrt there was showing two windows 7 and asking to choose one of them. i selected first one but its crashed with blue screen error. then i selected second one it also crashed with blue screen error as soon as starting windows appeared. I tried to reinstall windows again but it showing no driver found on partition window. In bios notebook hard drive showing but hard drive memeory test fails with error 303. what to do now... warrenty is over