You might try the Delete or all the F function keys also some computers use cntrl +alt +delete
Finding lost application install keys is quick and simple with this handy executable, a complete rewrite of a well-received earlier version.
Create a Windows 7 System Repair Disc: http://www.sevenforums.com/tutorials/2083-system-repair-disc-create.html
"This will show you how to create a Windows 7 system repair disc to use to boot to the system recovery options if you don't have a Windows installation disc, can't find your Windows installation disc, or can't access the recovery options provided by your computer manufacturer." If you do not have access to either disc: Windows 7 - Repair Disc download http://neosmart.net/blog/2009/windows-7-system-repair-discs/
a) Insert the Windows 7 System Repair DVD or Installation DVD and reboot.
b) Select the correct keyboard input method and click 'Next'.
Note: If you are using the Windows7 Install DVD then at the 'Install Now' prompt (Do not pick the Install Now option) instead choose the 'Repair your computer' option located in the lower left of the dispay.
c) The System Repair tool will search for a valid operating system and will report that "Windows found problems with your computer's startup options.
Do you want to apply repairs and restart your computer?"
d) Click 'Repair and restart' and reboot again to the Windows 7 System Repair environment.
e) Click 'Next' at the keyboard selection prompt and when the 'System Recovery Options' screen appears verify that the "Use recovery tools that can help fix problems starting Windows" is selected.
Note that on your Dual Boot system there now should be only one operating system listed. Click the 'Next' button.
f) Now from the menu list select the 'Command Prompt' option. g) At the DOS prompt type the following three commands: bootrec.exe /fixmbr bootrec.exe /fixboot (may return an 'Eliment not found' message) bootrec.exe /RebuildBcd
h) Close the command prompt window and click the 'Startup Repair' option.
i) The repair process may take some time, so wait until the process completes at which point you will see two messages "Windows cannot repair this computer automatically" and "Startup Repair cannot repair this computer automatically".
These messages are the result of the radical changes made by removing the other drive. Ignore the Send/Don't send options.
J) Close this message window by clicking on the X in the upper right corner of the Send/Don't send window.
Next click on the 'View advanced options for system recovery and support' option and from the main menu once again click 'Startup Repair'.
This time the repair process may only that a few seconds and when prompted "Startup Repair could not detect a problem", click 'Finish' and run the 'Startup Repair' option one more time, click 'Finish', and then remove the System Repair DVD and click 'Restart'. Reboot the computer.
Hope this helps. Keyfinder Thing's simple, easy-to-understand interface has Wizard-like efficiency. This application quickly scans your system registry for 90 supported software titles and displays product names and icons in the result window. Single-button clicks copy all keys to either a text or HTML file. b> http://download.cnet.com/product-key-finder/3000-2094_4-10694022.html
Product Key Finder is a single function utility that executes in a GUI, but displays a Command window result. You merely double-click it to display the 25 character Microsoft Windows Product Key. then store it away for safe keeping not on your computer