i think he's saying he CAN'T get into windows.
ok the post above me is ALMOST right, to boot from CD repair because you can't get into windows.
First insert the cd. After that press F11 or whatever key it is to go t a one time boot menu, than select the CD-ROM/DVD ROM selection (it may be spelled differently. After that it will say "press any key to boot from cd" do so basically press ENTER. Let it load up all the drivers and install files. It will than ask you what you want to do press the R key to repair your current windows. wait 10 seconds (unless your not using a US keyboard). It will than ask you to select a "Windows" installation, usually its the number 1 do that and it tells you to enter your Administrative password, just simply press ENTER (unless you have a password for your administrative account). than type in CHKDSK /F, after that it will tell you if there is errors and if it fixed them, but we aren't done yet!!!!, after thats all said and done its time to do one more thing. Type in CHKDSK /R and let your system run depending on the errors it finds and the size of your hard drive this can take anywhere from 10-60 minutes
maybe even longer. After that is all done, the fun part...type in EXIT and it will reboot take the cd out of the drive and hopefully that will work if not you probably need to reinstall windows.
hope this explains how to use the repair console a little-bit.
I'm a computer tech at a local repair shop this solution fixes at least 75 percent of all the computers that come in here
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EDIT: You may have to change the boot up properties in your BIOS to have your cd drive boot up before the HDD.