Upgraded OS to Yosemite, Windows runs slower

Last week I upgraded OS X to Yosemite, my VM is Windows 7. I was warned that my Parallels would need to be upgraded to fit Yosemite.
Before I upgraded Parallels to the latest, Windows 7 started operating very, very slowly. It would take up to 10 seconds to type this "word".
Yesterday I downloaded and I believe I installed the newest version of Parallels Desktop completely. Windows 7 was still extremely slow. I found a PUP program installed in Windows and removed it with AdwCleaner. Windows 7 was still just as slow. I used the Microsoft security scanner software to scan for 4 hours and it found no viruses. But Windows is still is extremely slow.
Is there something I needed to do after PD was upgraded to integrate it with Windows?

 

Hello William_Sullivan,
Please follow the steps provided below:
1) Follow the steps provided in this link: http://kb.parallels.com/112091 to improve virtual machine performance on your Mac.
2) Also please follow the steps mentioned in this article: http://kb.parallels.com/en/122767 as your Virtual Machine is extremely slow after the upgrade to Parallels desktop 10 and Yosemite.
If the issue still persists, please create a Problem Report ID and send us the Problem Report ID number so that we will check it and assist you further.
To create a Problem Report ID, please follow this link: http://kb.parallels.com/9058

 

Thank you very much Mervin. I followed the steps in item 2 of your response. I was very tense following those directions, treading in unknown territory, but it worked like a miracle! It took some time for me to catch up all the work that was backed up. Now I have time to say how much I appreciate your help.
The Windows Tech support guy in India could not do that. Nobody at Apple would understand what happened.
So thank you very much.

Bill Sullivan

 

Hello William_Sullivan,
You are welcome. I am really glad that your issue has been fixed.
Please feel free to get back to us if you have any questions. We are happy to help you.

 

I had this issue too on my mid 2011 iMac where I had to move the mouse to see text I typed in the VM. Everything was working fine Yosemite and Parallels 10 until I shutdown the iMac yesterday and ran Parallels today. Doing item 2 corrected the issue.