I have an error code 536756158, and I coudn't install pc tuneup, what can i do?

Kimia, Have a look @ this new form link (http://support.avg.com/support_contact_form) to get chat/phone support. Otherwise, When available, A member of the official AVG Community Support in Brno, Czech Rep… (Working Hours [Mon-Fri] 9:00am - 5:00pm CET) will see your topic & respond but obviously bear in mind that it's now the weekend.
AVG Guru

Hi Kimia,
In order to analyze it please provide us with diagnostic output (gather it right after inducing issue) using this tool and please add detailed description of issue.
Thanks

Kimia, Have a look @ this new form link (http://support.avg.com/support_contact_form) to get chat/phone support. Otherwise, When available, A member of the official AVG Community Support in Brno, Czech Rep… (Working Hours [Mon-Fri] 9:00am - 5:00pm CET) will see your topic & respond but obviously bear in mind that it's now the weekend.
AVG Guru