After searching for more than two hours I found the solution for the problem of TAP VPN driver installation in my PC, might be alot of people facing the same problem.
ISSUE:
Device Manager showing, TAP VPN ADAPTER but conflicted.
OPEN VPN Service: can not be started because, it is dependent on other services too.
Environment: WINXP SP3
Following solution I found on one website but it was not related to OPENVPN Installation or TAP VPN installation: I tried and it worked
Go to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion
With CurrentVersion Highlighted, go to the Edit menu and select New » Key
Name the key RunOnce, leaving everything else about the key alone.
The RunOnce key should now exist underneath the CurrentVersion key.
Once the key exists, Windows 2000/XP stops redetecting the Hardware
