Wheni update my tekkit a program i cant get rid of deletes minecraft.jar

[Minefriek]

Title: Wheni update my tekkit a program i cant get rid of deletes minecraft.jar

Version: 3.0.3/3.0.4

OS: windows 7

Java Version: not required for this problem

Description of Problem:

a program i cant get rid of because i play minecraft on a school computer deletes minecraft.jar every time i go to update my tekkit and it wont let me play tekkit until i update. i can get around it deleting minecraft.jar but for some reason the update makes the program delete it again. i was hoping that i might be able to get a downloadable copy of the updated tekkit instead of going through the launcher so i can apply my trick to that

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