W7 Black screen at login

I have a lab running w7.  a few weeks ago a few students had trouble when logging on.  right after the login screen goes away the screen goes black with a cursor.  I tried rebooting and eventually found if I waited 10-15 minutes the students screen would come up and they could work.  At first it was different computers and different students, not always the same student or computer but once a student had the problem on that computer they always have that problem on that computer.  I tried deleting the user folders to no avail.  Now the whole lab is taking 10-15 minutes for logging on and we do not have that kind of time.  Adults who log on and my admin logon do not have the same problem.  I have looked everywhere online and can not find a fix that works.  i tried one that i found but the download was no longer at that location.  i have teachers unable to use the lab because classes are only 45 minutes.  
jhwadminAsked:
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JAN PAKULAConnect With a Mentor ICT Infranstructure ManagerCommented:
switch them off do cmd on win 7 system gpupdate /force  restart and have look if windows starts normally
you might have some gp setting which are not fully supported by win7 - rg administrative templates you or one of your colleagues made
create ne gp - adding slowly all setting of old gp to find what has been causing this
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JAN PAKULAICT Infranstructure ManagerCommented:
do you have any group policies on system?
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jhwadminAuthor Commented:
Yes
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JAN PAKULAICT Infranstructure ManagerCommented:
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jhwadminAuthor Commented:
I have been working with my network administrator to resolve and communication is slow.  I have tried the /force and it has not worked. I will have to get back with her about the group policies.  I don't have access. will also try the microsoft address.
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JAN PAKULAICT Infranstructure ManagerCommented:
Could you kindly tell us which group policy setting was it ?

JAN MA CCNA
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