windows7 ubuntu boot cd dvd linux

About this tag
This tag covers discussions about booting Windows 7 and Ubuntu Linux from CD or DVD, often involving GRUB4DOS or similar boot managers. Users seek help when a dual-boot setup with Ubuntu leaves a GRUB4DOS menu instead of booting directly into Windows 7. Common issues include inability to change BIOS boot priority and needing to boot from a Windows 7 installation disc to repair or reinstall the system. The tag focuses on troubleshooting boot problems in mixed Windows 7 and Linux environments, particularly using optical media for recovery or installation.
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    Windows 7 Windows 7 boot (Grub4Dos)

    Some time ago I had Ubuntu Linux(alongside Windows 7) but now when I start my computer I have only option to press ESC and when red GRUB4DOS window appear. I really don't know how to use It. I have Windows 7 cd but I don't know how to boot It, because I can't change boot priority in BIOS(can't...