Gateway support found this? hmm I work for Sykes which handles Gateway support
http://www.sykes.com and sorry mate such a search would be out of the scope of support. They will simply have you do a reinstall from the restore partition to ensure the machine is operating to the standards when shipped. They will not touch anything that is 3rd party. ie SoE, Office 2007 etc. you would be lucky to get a support call center operator to help install a printer that didn't come with the machine.
You're trying to claim a well known UI modder has a trojan in his UI which he put there.
first you said " open up window in game. try talk and take stuff out your bank. please remove his ui." now you're saying it destoyed your armor. And on the note that no scanner will find a trojan well then I guess we all should stop using anything that could possibly have malicious script in it because nothing out there is going to find it. Trust me there are some rather nifty (and costly) programs that do scan better than the store bought or net purchased stuff most use. Theres also the mere fact that since this is all xml the gateway guy would need a good understanding of how it all ties together to determine if such thing was in the UI and I doubt thats a thing Gateway would spend time looking for. I could be wrong and have been wrong in the past but hey its my opinion and experience with support calls. Support call operators/techs have a set method of doing things to keep call times down.
Site Operators can you check the file to see if hes got any merit to his claim?