thanks for sharing your concerns here.
First, mTrax is 100% Windows 7 compatible so you do not have to run it in any compatiblity mode.
Second, a 45 gig library should not pose any problem and should load in seconds, with plainty of memory left to run all of your other programs. I use a windows 7 laptop and my 68 gig library (about 12,000 songs) loads in seconds, much faster than with iTunes.
Also, with mTrax, you have many options when it comes to singling out one or a few tracks. One of them is to create additional libraries, pointing to tracks in different folders on your computer. For example, you could create one library just for songs that you play in your cover band.
Of course, this does not necessarily solve your problem so i would suggest that you send me an email with your phone number at email@example.com. I am sure i'll be able to help you either via phone or using https://join.me/ (web meeting) if you wish.
Looking forward to solving this one with you!
PS: mTrax does not copy your audio files when a library is created. Like iTunes and Windows Media Player, mTrax only saves a reference to the location of your audio files. So if you change the Artist name of a track from say, 'Jimmy' to 'Jimmi', you will see that change in iTunes and WMP as well.
PPS: the trial period is based on the number of uses (30) AND the number of days (30), whichever comes LAST. So even if you are out of 'uses', you could still have many days left in your trial period.
-- 5/12/2011 5:19:17 AM: post edited by centralscrutinizer.