outlook open pst "access denied"

run Outlook 2007 as administrator (rigth click on the outlook program icon -> run as
administrator ) and reopen pst.

Fix Office 2007 ost file

run C:\Program Files\Microsoft Office\Office12\scanpst.exe
select the ost file (path displayed in msgbox on opening outlook)

Find if Vista is 32bit or 64bit

Method 1: Start, type system in Start Search, click system in the Programs list.
The operating system appears as follows:
64-bit Operating System appears or 32-bit Operating System appears

Method 2: Start, type system in Start Search, click System Information, select System Summary, see system type: x64 for 64bit, x86 for 32bit.