Run the installer as administrator.
ok, i feel stupid now. when did 'run as administrator' become part of the right click menu options!?! last time i installed mids, windows just prompted me for permission. guess i should have picked up on the fact that it wasn't asking me for permission this time. OW... :/ thanks for the help.
i did a reinstall of my OS (win7 64) and when i went to install mids, it won't unpack. i have tried downloading it a few times from diff sites. is mids broken or something? was running just fine b4 i re-did the OS. i've been on win7 64 bit since shortly after it was launched last year and had no issue with mids till now. any tips?