PC Performance Tool in PC Tune Up

Denise
Also these steps given by Zbynek AVG Employee here can help

It is necessary to download the file msxml3.zip, uploaded to dropbox, and Register the Msxml3.Dll
https://support.avg.com/answers?id=906b0000000D4TUAA0

Try instructions and tell here the result
Thanks

Thanks for your help guys.  Still no luck.  Some I was able to figure out, some I just couldn't figure out on Windows 8.

There is no start menu, so after that I have no idea where to go. 

Thanks for trying to help!

Thanks, I appreciate everyone's help.  I have run all of the fixes, including running sfc/scannow numerous times. 

Nothing has worked.  I still get the same error message. 

PC Performance says there are 12 recommendations found.  When I try to run it I get an immediate error message that says: 

Sorry, an error occurred when loading the Windows Library msxml3.dll

It won't let me do anything at all from there.  Any ideas?

Hello Denise
Please if you receive a message
error occurred when loading the Windows

Try these steps described here
http://techraptor.net/content/error-fix-msxml3-dll-either-designed-run-windows-contains-error

And then try to run PC Performance
Thanks
Hi Denise,
You should be able to open run dialog by pressing "Win key + R".
Thanks
Hello Denise, we sincerely apologize for the inconvenience caused. We really appreciate your patience and efforts. We would suggest you to contact our chat support via http://bit.ly/1EC2Cp1 . They will be happy to assist you to resolve your issue.
Thanks for your help guys.  Still no luck.  Some I was able to figure out, some I just couldn't figure out on Windows 8.

There is no start menu, so after that I have no idea where to go. 

Thanks for trying to help! 
Denise
Also these steps given by Zbynek AVG Employee here can help

It is necessary to download the file msxml3.zip, uploaded to dropbox, and Register the Msxml3.Dll
https://support.avg.com/answers?id=906b0000000D4TUAA0

Try instructions and tell here the result
Thanks