I installed windows 7 ultimate in my laptop.after formating the system i deleted the folder with the name "WINDOWS.OLD" from the "C:/" drive later I installing visual studio2010 ultimate in my laptop.it is installed successfully. while opening visual studio it is showing an error that "PSAPI.DLL".FOR that i am dowlodaing that dll as zip file and replace that in "C:/WINDOWS/SYSTEM32" but the problem is not solved...........can any help to solve this problem....................please send a mail to sgvkiran@hotmail.com