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Can't install Windows XP 64 bit OS replacing Win7 Ultimate
I trying to install Windows XP 64 bit OS on to my Lenovo R500 laptop. I have Intel core 2 P8600 processor (64 bit cpu) and 4 gb of ram. I have a 500 gb harddrive and am currently running Windows 7 Ultimate.
The installation starts as usual loading all of the drivers and files and when the bottom of the screen message says, "starting windows" I get a blue screen error message that says, "check hard drive, run chkdsk /f , if this is first time reboot, check for virii" etc.
The error is 0x0000007B!
What is that and how do I get around it?
Has Win7 Ultimate written something to my hard drive that prevents me from installing the 64 bit version of Win XP?
thanks