drive of windows installed

[ghkumarmvk]

sir,
anybody have the code of getting the drive name (eg: C:\, D:\) where windows installed for a nsis file? . i created a setup program to install my program using nsis. now i coded C:\ or D:\ directly on the code, but i want the setup program to check whether the windows installed on C:\ or D:\ and that drive letter shown in setup program to install .
any help??
with regards
G.H.Kumar