My computer has xp operating system.when i click drive D then does not open directly its alwyas open with "open with Window" to choose programme to open.Kindly someone solve the problems.Thanks
Right-click explore. that would work.
You are infected.
Any drives that does not open with explorer is infected by something and most times the autorun thing, download the PRT file from HERE to remove it.
Before i forget, that should be run in safe mode