There are several reasons whydownloading DLLs like that is never a good idea.
The advrcntr5.dll error might be a fluke and a simple restart could clear it up completely.
Record theserial numberof your particular Nero installation.

One way to do that is with a product key finder program.
Uninstall Nero from your box.
Another way is to use thePrograms and FeaturesorAdd/Remove Programsapplet inControl Panel.
Download Nero General CleanTool.
Extract and then run this free program from Nero.
This utility will ensure that Nero is completely removed from your rig.
This file is in theZIP format.
Unzip it from within Windows or use a dedicated file unzipper like7-Zip.
Nero General CleanTool is only guaranteed to work up through Nero 9. kickstart your system again, just to be safe.
Reinstall Nero from your original installation disc or downloaded file.
Hopefully, this step should restore the advrcntr5.dll file.
drop in the latest update to your Nero program if there is one available.
reboot your machine, again.
Reinstall HTC Sync Manageror disable HTCMonitorService to see if that’s what’s causing the advrcntr5.dll error.
To suspend the service, execute themsconfigcommandin Run orCommand Prompt, and then go into theServicestab to disable it.
If this fixes the error after a reboot, be sure to reinstall HTC Sync Manager.
Some advrcntr5.dll issues are actually related to hostile programs that masquerade as the advrcntr5.dll file.
The advrcntr5.dll file should be located in theC:\Program Files\Common Files\Ahead\LiborC:\Program Files\Common Files\Nero\AdvrCntr5folder.
The advrcntr5 DLL file must exist in the correct folder for Nero to burn CDs or DVDs.
The advrcntr5.dll issue notification could also be related to HTCMonitorService used with HTC Sync Manager.
This program is installed within the Nero installation folder, so they’re closely related.