PDF opens fine, but when I try to page down or scroll down with the mouse, it hangs the file

Pdf files open fine in Acrobat 9 pro.  I am having problems in page down or scroll down on the document.  Only way to close the file is to go to task manager and end the program.  In task manager it shows that there are 2 adobe acrobat files opened and not responding.  What can I check or do about it?  I have tried to disable all plug-ins, but that didn't help.

Sometimes a problem with Firefox may be a result of malware installed on your computer, that you may not be aware of.
You can try these free programs to scan for malware, which work with your existing antivirus software:
* [http://www.microsoft.com/security/scanner/default.aspx Microsoft Safety Scanner]
* [http://www.malwarebytes.org/products/malwarebytes_free/ MalwareBytes' Anti-Malware]
* [http://support.kaspersky.com/faq/?qid=208283363 TDSSKiller - AntiRootkit Utility]
* [http://www.surfright.nl/en/hitmanpro/ Hitman Pro]
* [http://www.eset.com/us/online-scanner/ ESET Online Scanner]
[http://windows.microsoft.com/MSE Microsoft Security Essentials] is a good permanent antivirus for Windows 7/Vista/XP if you don't already have one.
Further information can be found in the [[Troubleshoot Firefox issues caused by malware]] article.
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