You made MW3 work on Win7?
I ran it on an XP box (my craptop had serious GFX issues, hardware mode had trash, software mode had inconsistent high-speed problems as in I would pause for a second then move a large gap forward while at full throttle, despite me trying to hog the processors with CPUGrab).
Boy, I gave one of my team mates an Annihilator with dual Clan ER PPCs and dual AC-10s (had 80 rounds of ammo total), he scored a lot of kill shots. (It helps that the MFBs start the campaign with almost 1000 rounds of AC-10 ammo.)
In Ops Zone 4, I only had a few Mechs left and said screw it, ER PPC bumrush (I kinda wasted a lot of my LRM and MG ammo by boating it, and hell, I had about 150 Clan Double Heat Sinks to waste on my team mates by the time I reached that area) and I gave myself LB-10X ACs (to core CTs) or AC-10s (if legging for salvage is a priority) with three or four standard MLs. Surprisingly, that worked.
Lesson learned: do not underestimate Light mechs, especially with ECM. I just had to post this, I could not pass it up.