AVG Internet security

I am having a problem with my AVG Internet Security. Tried installing today a few times and I continued receiving errors. Failcode 0xC0070643. Description: Event_exec finished

I bought this new laptop from PCWorld already set up, I removed the macfee antivirus but still can't install the AVG.

Hope you can help me,
Many Thanks

Marta, Are you absolutely sure that you've completely removed all traces of McAfee?. Did you download & run the McAfee total removal… (http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe)?.
AVG Guru

Marta, Are you absolutely sure that you've completely removed all traces of McAfee?. Did you download & run the McAfee total removal… (http://download.mcafee.com/products/licensed/cust_support_patches/MCPR.exe)?.
AVG Guru

No Alan, didn't work. I still can't install the AVG and the same message appear.