I am new to VBScript, please any one help me how to write a code for selection of installation drive, i.e i want an option to select the C drive or D drive?
Perhaps it's just *me* ... but your question appears a bit ambiguous. Are you needing to determine on WHICH drive a particular (code/files) exists? OR, do you wish to 'Specify' a drive (for installation or other purpose)?
Scroll-down to "Parsing a Path Name" at THIS page for a "hint".