Well, try login into save mode of windows 7 by hitting F8 during boot time.
Go to device manager, expand display adapters, point to your video card, right click and choose uninstall. okay
then disconnect the network cable and other extra devices you have like printers cables, usb flash, ...etc
now try to boot windows 7 again normally and look if it will run without problems. if so then re connect all devices one after one and see where you will experince problems again.
You can always overwrite any operating system if you choose not to FORMAT the partation during installation. some programs will stop working but data will not be loose. So if you want to install vista now boot from the installation disk and when prompt to format the partation choose LEAVE CURRENT SETTINGS.
windows will ask to delete the current system folder and use it for the new system press yes.
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