Thanks. Even v4.2 crashed, so it's obviously something with my computer. I removed a bunch of programs that I don't really use, and disabled some things in msconfig. I just reinstalled the current version, and it still crashes. I guess I'm just not meant to use Skype. Oh well.

Programs that run at startup are:
-igfxtray.exe, igfxpers.exe - for the Intel graphics card
-smax4pnp.exe - for the sound card
-msseces.exe - MS Security Essentials
-syntpenh.exe - the touchpad manager
-launcher.exe - the Thinkpad fingerprint scanner monitor app
-rundll32 - which runs the Bluetooth radio
-ctfmon.exe - something to do with Office
-MozyHome status - for Mozy, my backup.

And that's it.

edit: I turned on just about every service that would start, and Skype still won't run.