I keep crashing upon log in with my main account. I can log in fine with my alt.

[Griffin Ceawlin 686]

Try clearing the cache.

[Griffin Ceawlin 686]

Try clearing the cache.

[PeterCanessa Oh 427]

Is this the same as your January post http://community.secondlife.com/t5/Technical/Cannot-log-in-on-one-account-disconnecting-upon-loading-in-stuck/qaq-p/1358151?  How has performance been since then?

[Inuoko Shikami 0]

Maybe an attachment on your avatar is a bit corrupt, or maybe an inventory loading issue. I'm not exactly sure how corrupt attachments/inventory errors effect other computers but well a character test paired with a cache clearing may be worth a shot: 

http://wiki.secondlife.com/wiki/User:Tourmaline_Falken/The_Ultimate_Multi-Bug_Fix.

Havr you thought about reistalling SL? Consider a "clean install": http://blog.nalates.net/2011/02/22/second-life-clean-install/