What operating system is this and is it totally up to date, including the latest version of Internet Explorer, even if you don't use it?
What other security software is present if any?
Have you been using any sort of registry cleaner lately? If so, does it have a restore button.
As far as questions regarding Visual C++ etc. best to go back to Tech Support and give them the old SR# and ask for escalation to a higher level.
Using Windows 7 Ultimate x64bit the system and IE are all up to date and no other security software preset on my desktop.
Then first run AdwCleaner and Malwarebytes Free both from the last link below and scroll down to the 3rd Party section. Follow the instructions to make sure you get the free version and NOT the free trial.
Try running the latest MCPR from here: http://us.mcafee.com/apps/supporttools/mcpr/mcpr.asp (it was recently re-released so older downloaded ones aren't effective any more), reboot, try your reinstall again.
If not then tackle Tech Support again and this time make sure they escalate it.
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Oh before running MCPR remove McAfee from the programs and features area in control panel. This will free up the licence used.That is if Mcafee is actually showing as installed.