says errors in pst but scanpst.exe says ok, can’t open

I receive the following error when trying to open my Outlook 2007 on my WinXP pro: “Cannot start Microsoft Office Outlook, Cannot open the Outlook window. The set of folders cannot be opened. Errors have been detected in the file F:\Data\Outlook PST Files\Outlook (2005-2006).pst. Quit Outlook and all mail-enabled applications, and then use the Inbox repair tool (Scanpst.exe) to diagnose and repair errors in the file….” However, when I run scanpst.exe on that file (and my other pst files) I get “No errors found”. Chkdsk also resulted in No Errors. Of note, I just had to replace my Motherboard and PS and reload my harddrive drivers. My Outlook files are on an internal SATA drive. Any ideas / input is appreciated.