You could try to restore your system. Since you seemingly don't get to Windows properly, do as follows:
Before the Windows splash = "Starting Windows" press F8, that'll take you to to Safe Mode. It may take several tries, because pressing F8 is a rather delicate matter - if you miss it, restart and try again. When you get to Safe Mode, look for Recovery in Control Panel > Open System Restore > Next, then pick an "old enough" point - it may not show many points, but down left there is a choice to "Show more restore points".
Hope this helps. For starters, at least.