Microstudio 4.000 install error 7a

[jonromi]

Purchased upgrade for Karaoke Suite 4....tried to install Microstudio 4.0000....3 or 4 times...even downloaded it again from My Account....
have checked and rechecked registration number...even "copied" & "pasted" the number !!! No install.....Went ahead and installed Keyrite,Vogone, & KH Pro without a problem.
I have left "Support Tickets" 2 times 1 last week and 1 today....I logged off the web site and came back later...but it shows I don't have any
"Support Tickets" open (or closed )
I'm totally frustrated !!! Wish someone would tell me what I'm doing wrong.... I'm not a computer whiz.....but I have never had this much
problem finding support or installing a program !!
2.66G Pentium 4 1 g Ram 90% free...so shouldn't have any problems
The old Microstudio is now uninstalled...as a result of trying to install the new one.