Problem installing mod on minecraft server, help me?

so im trying to install toomanyitems on minecraft server 1.6.4, and both of my archive programs cannot delete META-INF or install the mod files. 7 zip gives me a not implemented error and winRAR says that it is a corrupt archive. i have re-downloaded 3 times and i get the same errors. yes, toomanyitems is designed for 1.6.4. stange thing is, it will install the mod and delete META-INF on singleplayer but not on minecraft server. i am running windows XP and the exe version of minecraft server, as im not patient enought to set up a path for the .jar file. pls help cause this means i cant install any mod and i need them. thx and 10 points