For installing windows 7 from your hard disk you have to replace window XP boot loader with window 7 boot loader. Window 7 bootloader loads the window 7 setup files. Follow these simple steps for doing this
Step1: Open the downloaded file
Step2: Extract the following files and folder to C drive or the system drive which has primary partition.
Boot, Sources, bootmgr
Step3: Now go to start > Run> cmd> and type the following thing
cd c:\boot bootsect /nt60 SYS
Step4: After this start your system and window 7 installation will start.
(Make one thing for sure do not install window7 on your primary partition or C
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