0x80300024

I'm running: VISTA ULTIMATE Seagate 250GB - VISTA 32bit installed Seagate 1TB - Data Files Seagate 250GB - want to install WIN7 64bit During installation when selecting the blank hard-drive Seagate 250GB for installation WIN7 64bit, I get the following: ERROR: 0X80300024 and can't proceed. Any...