[操作疑難] a55vm.安裝win 7問題

小弟對電腦不是好叻.但有個問題想問一問.就是我部asus手提電腦是用win 7home prem oa版的...之前壞個一次但過了保養我就拎去黃金個d鋪頭重裝一次win 7.但用唔反asus原廠野...個個人幫我裝反win 7都用到個正版key.但近排我部機又壞在我自已再裝過win7 home版.但用唔反個win 7個key話我是老翻黎..我都唔知點好...我打去問asus話買機過時有無燒反個幾隻碟出黎做後備..有咩事可重裝.但我無燒呀...我問可唔可以裝win 7home版呢.win 7home prem oa和win7 home版有咩唔同呢...現在win 7話我是老翻變在黑晝面了...有無師兄可以教教我可以點裝win7用反正版呢