Windows Startup Problems in Bootcamp - 2013 iMac

I installed windows 7 via bootcamp and all seemed to work out well.
But then I downloaded and installed the windows updates and this forced my iMac to restart a few times.
It seems like sparatically on restart it either boots right into windows or before windows starts to load it gets hung up on a white/grey screen. (the iMac is still defaulted to startup windows I haven't changed that yet)
So in the latter scenario I have to hold the power button down to shut off the iMac and then restart and then it loads windows properly.
Is this a common problem or does it sound like something might be wrong?
Maybe something with my bootcamp is wrong?
This is my first imac so maybe it's a common thing?
Any help is very much appreciated.
Thanks.

It will make the startup 'bong' and then proceed to show me the Windows loading screen, but then a blue screen with white text flashes briefly and then the screen goes black, and it restarts. This loop does not end of its own volition.
A quick explanation of what's going on, first. What you're getting on start up is a traditional Windows "blue screen of death" or BSOD. (Technically, it's known as a STOP message.) But your XP is currently set up to restart when it gets one of those errors. Since you're getting one when you start XP, you get that constant restarting behavior.
First we need to switch off the "automatically restart" system setting.
Next time you start XP, tap your F8 key repeatedly. That should bring you to the Windows advanced options menu. Select "Safe mode."
Does XP launch in safe mode? If so, right-click "My Computer" and select "Properties". Click the "Advanced" tab. In "Startup and Recovery", click the "Settings" button. Uncheck "Automatically restart" and click OK.
Now attempt to restart XP normally. When the blue screen comes up this time, note down the numnerical and text codes that come up (ie 0x<zeroes-letters-numbers> CAPSANDUNDERSCORES). If the blue screen also mentions a specific file, note that down too (exact spelling please, including filename extensions like .sys or .dll).
Post back to let us know that information, because that may help narrow in on the cause of the BSOD in your particular case.

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