Backup failed after loading PC tune up

No, that didn't fix it. To try to fix the backup problem i followed up error message 0x800706BA: none of the solutions suggeted in forums worked. To fix the System restore problem i then followed up error message 0x800706B: again, no good.
Finally i stumbled on error message 0x81000203. This advised that that my problems were caused by the Turbo option in PC Tune-up. I switched to standard mode and, hey presto, problem solved. Hope this knowledge will help others.

Hello Nigel,
We are sorry to know about the inconvenience caused. I suggest you to Open the AVG PC Tune Up program -> Click on 'Rescue Center' - Undo changes. Please restore changes made by AVG PC Tune Up program and let us know the status. Thank you.

I've recentlyloaded the latest PC tune up and have been through the options to improve performance (which it has done). However, when i tried to run the usual Microsoft backup process (in Win 7 Ultimate) yesterday it failed.
I think i may have inadvertantly disabled a service that i need: The error message is "The RPC server is unavailable (0x800706BA)" 
Your advice will be gratefully received.

Hello Nigel,
We are sorry to know about the inconvenience caused. I suggest you to Open the AVG PC Tune Up program -> Click on 'Rescue Center' - Undo changes. Please restore changes made by AVG PC Tune Up program and let us know the status. Thank you.

No, that didn't fix it. To try to fix the backup problem i followed up error message 0x800706BA: none of the solutions suggeted in forums worked. To fix the System restore problem i then followed up error message 0x800706B: again, no good.
Finally i stumbled on error message 0x81000203. This advised that that my problems were caused by the Turbo option in PC Tune-up. I switched to standard mode and, hey presto, problem solved. Hope this knowledge will help others.

Hello Nigel,
Thank you for your kind post and for your support of AVG products. That's great to hear your issue has been resolved now. If you are facing any further issues with AVG program please let us know and we are happy to assist you.  Please feel free to contact us for further assistance.