Spoilt8920

Hello, been enjoying 1.1.5 on my server but just recently i started getting random crashes with reports talking about mobs?? http://pastebucket.com/16211 - most recent crash report at time of writing

hi im trying to run a server using windows server 08 r2 with latest java installed, i can successfully run a normal minecraft server and connect to it but ive tried tekkit 1.0.6 and 1.1.5 as well as hexxit and when it starts loading mods and such it stops and crashes the whole computer causing me to have to reboot it, nothing at all is recorded in the logs and i have no idea whats going on.... please help!