Since you pointed it out, I want to let you know that there's no way you'll be able to record MWLL footage at an acceptable framerate or level of detail for any kind of video. An ATi Mobility 5145 is just a re-badged HD 4650, which was a semi-decent mid-range card in late 2008 when it was released. While there may have been some great optimizations done on both Cryteks and ATIs ends, that card could only pull 6-8 FPS in vanilla Crysis at 1024x768. In MWLL, while running some kind of software video capture, you'll be lucky to get 5 FPS on the lowest of settings.
All other issues aside, you may want to have someone else with beefy enough hardware do the recording.