Depending on the problem and if you do not want to reinstall the OS(remember backup) you can either restore Windows to a prior date before the problem or boot with a Windows 7 DVD and try a repair.
You can also access prompt from the DVD and run diskcheck and bootrec commands.
Do research before using commands.
yes
you will have to boot up your computer from the windows 7 DVD and repair the installation (I guess its called startup repair). OR If you have Windows XP installed on the same PC, then use Vista Boot PRO (Totally free) to restore Boot manager info to your windows 7 partition
it has start up repair option that vista did not have
You can't really, if you're desperate you will have to re-install windows
Bootrec /fixmbr
You can apparently 'roll back' a Windows 8 computer to Windows 7... HOWEVER - some computer manufacturers have said they will not repair a Windows 8 machine (even if it's still under warranty) if it's been rolled back ! They claim rolling a Windows 8 machine back to Windows 7 voids the warranty !
Put in the Windows 7 repair disc, it will ask you some stuff just choose fix start-up.
Apparently, Windows 8 can be 'rolled back' to Windows 7. HOWEVER - some manufacturers say your warranty is void if you do it - and will not do a (free) repair if your computer goes faulty within the guarantee period !
Creating a Windows 7 repair disc can be really useful in fixing issues or recovering your operating system in case of a system failure. While there is no built-in utility in Windows 7 specifically for creating a repair disc, you can still create one using the built-in Backup and Restore feature. Here's a step-by-step guide on how to create a Windows 7 repair disc: Go to the Start menu and open the Control Panel. In the Control Panel, search for "Backup and Restore" in the search bar at the top-right corner. Open the "Backup and Restore" option from the search results. In the left-hand sidebar, click on the "Create a system repair disc" link. A dialog box will appear asking you to insert a blank CD or DVD. Insert a compatible disc into your computer's CD/DVD drive. Select the CD/DVD drive from the drop-down menu, if it's not automatically selected. Click on the "Create disc" button and wait for the process to complete. Please note that this method will only create a Windows 7 repair disc and not a full installation disc. It's important to have a valid Windows 7 product key to activate and use the repair Visit us : Affordablekey
Windows Recovery Environment
If you are asking about creating a bootable flash drive, I can recommend an application called Bootsage to create a Windows 7 installer flash drive. It runs under Windows XP as well as Windows 7. http://firesage.com/bootsage
It might but most likely it will not. You might even get a warning state that you are trying to use different installation disk.