|Reboot the computer and start tapping the F8 key. This should get you into the 'safe mode' menu. The top option should hopefully be 'Repair Your Computer', select this and follow the prompts - you will be asked to select the keyboard country and, if necessary use your logon password. Then choose 'startup repair' - it will look for your Windows files and then check to see if there is a problem with the start-up and hopefully repair it.|
Give this a go first and post back.
"I've always been mad, I know I've been mad, like the most of us..." Pink Floyd