Mid-2010 iMac randomly freezing after last Windows 7 update. Help! I am a teacher and have 50 computers all behaving the same way.

I am a teacher and have 50 mid-2010 iMacs running Windows 7 in my classroom. The computers did a Windows 7 automatic update on or around April 15, 2014. After that, each computer randomly freezes. Some are worse than others. Most of the computers freeze when a USB drive is plugged in and also when a pop-up shows up on the screen - especially the Java update. I have installed the most current Bootcamp drivers and run several anti-virus program searches. I've also tried the Microsoft Fix-it program and almost everything. Uninstalling the updates did not help. Can anyone help me out?

based on what you wrote this doesn't make sense
use system restore to rollback the machine prior to this update
LChappelear wrote:
Uninstalling the updates did not help. Can anyone help me out?

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Not sure whether you have tried these methods, if yes, keep trying the others.
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w: http://blog.mastykarz.nl | t:
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Come back and mark the replies as answers if they help and unmark them if they provide no help.
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sorry for my english. its not my native language.
greetings.

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Mid-2010 iMac randomly freezing after last Windows 7 update. Help! I am a teacher and have 50 computers all behaving the same way.

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