If you press F8 as after you boot your computer but before windows actually boots you should get a list of options including start windows normally and last known good configuration
The actual point that you press F8 can be a little hit or miss so you may have to try a few times to get it. If I ever need this menu I just tap F8 after boot and and keep tapping till it works :D. if this does not work you may have to do a start-up repair. have a look Here for the tutorial
This tutorial may be able to help you out. It will show you the usual ways on how to leave Safe Mode and boot back into the normal mode of your deskop.