er did you uninstall trend micro using its properity removal method? If you just used windows add remove programs or win 7 equivalent bits of trend moicro will remain and mess up the Mcafee install.
see they recommend the removal tool after using windows removal.
All that said what is the PC specs not a P$ with single core cpu by change that does not run well with Mcafee especially with low ram.
Re money back there is a 30 day refund option call customer support
refund optionss here
Though I would call technical support they could get it working I have it on 3 PCs e6600 core2 duos and higher all with 2gb+ram and have no issues.
Good luck whatever way you go
Yes I did. I used a tool provided by Trend Micro to COMPLETELY remove their product before installing Mcafee
OK that was the correct way only thing I sugest other than the refund is let tech support look into it. What were the PC specs. It is a possibility that the install got corrupted as no net access is not an with Mcafee as far as I now of the current issues.