when u are installing mac OS x dual boot sometimes ur bootloader can crash.At that time how to make windows active.
Easy way Follow the steps
step 1:insert the windows vista OS dvd and boot it
step 2: choose repair ur computer and choose next and choose command prompt.
step 3:now in command prompt type the following diskpart and press enter and type select disk 0 and press enter
step 4:then type list partition and press enter your partitions are now will be listed
step 5:select the partition where u have installed windows
eg generally if u install it in c(partition 1): then type select partition 1 and press enter
step 6: now type active
step 7:that's all Reboot ur windows and now u can able to boot in windows
Easy way Follow the steps
step 1:insert the windows vista OS dvd and boot it
step 2: choose repair ur computer and choose next and choose command prompt.
step 3:now in command prompt type the following diskpart and press enter and type select disk 0 and press enter
step 4:then type list partition and press enter your partitions are now will be listed
step 5:select the partition where u have installed windows
eg generally if u install it in c(partition 1): then type select partition 1 and press enter
step 6: now type active
step 7:that's all Reboot ur windows and now u can able to boot in windows