launcher starts up then closes

[pkkpirate]

Launcher Version: laitest 3.0.0.383

Operating System: Windows 8

Java Version: jre 7

Antivirus Program: avast

Description of Problem:

recently i downloaded the tecnkic server, and have to change my enviroment veriables, so java could be recognised as a program, and now my launcher opens first launcher logo, asks if i want to change install dir, i click no, it dose nothing,

well actualy sometimes it gets to the login, and i try to enter my username, get half way through and it closes itself, no .tecnic folder or anything has been made, what do guys? thanks

i found the fix within miniuts of this post, it was my antivirus, if i have any more problems ill be sure to ask, thanks anyways guys

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