if you want something easy to learn on but almost final cut on windows, get ulead meadia studio pro. thats what i used until i could afford my apples and final cut. it was super easy to learn, ive made a good 15-20 movies with that, but yeah if you are serious about it, i wouldnt waste the time, id sell your crappy hp and get an apple.
avid is ok, but its the hardest thing to get the hang of, i can usually teach myself programs pretty quick...but avid took me a while.
sony...personally i dont buy anything sony. i had the vx-2000...3 weeks after i bought it, the top handle just fell off...it hadnt even left my room yet. their stuff trys to focus too much on the OOOH AHHHHHHH.
but then again thats all my personal opinion. other than that, screw mini-dv go super 8 or 16 mil. thats what ive been working with a bit lately.