I have two machines with this problem: the laptop has this issue for about a month and the pc has just started developing the issue. in short, when Windows 7 x64 Pro starts up it takes ages to start up and it wont start. SO you pull the plug and then it automatically attempts repair and offers system restore. The system restore completes successfully and Windows starts up ok. If you restart the computer straight away it will restart fine but if you leave it off for couple of hours you are back to square one i.e. Windows takes ages to start and you do system restore. And so on and on.
Originally, I thought it may be Windows update but we had quite few of them on both and I cannot pin point which one it is although I was thinking it may be KB2952664. There were changes except updates on the laptop prior to the problem starting up and on the pc it was updates and Microsoft EMET installed. Both systems use AVG which update automatically. I ran check disk and sfc but it didn't help.
Unfortunately, I am unable to do the restore to the point before all these updates nor I do have backup.
I would appreciate any help and ideas.