If Recovery options will not run by tapping the key given for this on first boot screen, check that Win7 hard drive is detected under Storage or Boot Priority order (usually by its Serial which you can google to find maker) and set to boot first.
If you need a Win7 disk to boot you can burn a on another Win7 PC as long as it has the same 32- or 64-bit version, use an enhanced Repair disk available for download at or refer to Step 1 in for installation media which contains repair or if necessary can be used for reinstall. Trigger the boot disk or stick using the one-time BIOS Boot Menu key given on first screen: Asus - F8 HP/Compaq - Esc Sony - F2 Acer - F12 Gateway - F10 eMachines - F10 Toshiba - F12 Dell - F12 IBM/Lenovo - the blue Thinkvantage button, or OneKey button next to Power button. Make sure the Win7 HD is set first to boot in BIOS setup. Then from run and if necessary System Restore. Confirm using or free CD that these partitions are intact and run on all of them including Win7 partition. A UEFI install has a EFI System partition instead of System Reserved, and a (hidden) MSR partition, can only boot from a. A UEFI install to GPT disk must have its installation media or Repair CD booted as a UEFI device. Only the System partition booting the OS should be marked Active. If not skip to Step 9 to get more help since Win7 will not repair unless the correct partition is Set Active. If another partition than System Reserved or C holds the Active flag and you know this is how it was set up, then go ahead with the repairs. On some PC's the Recovery partition or an earlier installed OS used in a Dual Boot will hold the Active flag. If both the System Active and Win7 partitions are on the same hard drive then unplug all other drives to do these repairs. On a Legacy install to MBR disk, confirm the is the 100mb System Reserved (preferred if you have it) or Windows 7 partition (if you don't), run repeatedly up to 3 separate times with reboots in between each - no matter what it reports.
Boot into via the F8 menu or disk as shown in blue link tutorial, open a Command Line to run a full (chkdsk /f) on both the System partition and Windows partition (if they're not one and the same). This is a quick operation that is often useful when non-booting is due to a recent system change. Via the F8 menu, choose the 'Last Known Good Configuration' option to attempt to return the machine to a working state. To conserve space illustrated tutorials are included in the blue links which you can right click to open in a separate tab. Feel free to ask back any questions in Comments section or start your own descriptive thread. Please read through all steps before beginning as you may wish to start with one that seems to apply more.