mera Laptop Sony Vaio Core i5 ram 6gb hai.
maine pahly 2 windows ki hoye the 7 & 8 to maine window 8 ko vaisy he window 7 run kar k 8 vali drive ko format kar diya tha laken vo ab b option main show hoti startup mian ..main osy msconfig main ja k boot sy osy delete kar do phir vo vaha show nai hoti startup py laken startup bohat slow hogya hova .laptop on karien to sony vaio likha ata osky bad jub 2 operation system ki option jaha ati the choose 1 vaha kafi dair screen black he rahti

koi eska solution btay k kaisy window startup sahi hoga k jaldi start ho jaya kary ,.plzz