I've uninstalled and re-installed MT4 same result. Running WIN 7 and this just started last week. Been running the same version until the uninstall for a year with no problems.
I just moved to Win 7 myself... Had no problems with it in 'c:\program files (x86)'. Why do u think we shouldn't run it there?
Edit: found the answers I was looking for here -> https://www.mql5.com/en/forum/112576, https://www.mql5.com/en/forum/116561.