can't access drive after new win 7 installation

[aek2007]

hello, l've recently re-installed windows 7 on my computer, it used to have windows 7 and windows XP ( dual boot) but it got really slow so l had to re-install win 7 but the problem now is that my ''D'' drive wont open , it sais cant access D drive when I try to open it, it was the drive that used to contain the windows XP files and l have some really important stuff on it and now l cant access them , btw l installed windows 7 on the "c" drive after l formated it, and there was no problem with the "D" drive b4 installation
here's a pic of my problem , plz l really need help cuz the things on that drive are reallly importanttt thank you ..

 

[Ivan the SoSo]

Disconnect the data and power connections boot up...shut down...reconnect drive....restart....if that doesn't work, replace the IDE or sata cable.....