is my computer infected?

i ran Rkill on my computer and got this:
This log file is located at C:\rkill.log.
Please post this only if requested to by the person helping you.
Otherwise you can close this log when you wish.

Rkill was run on 02/17/2011 at 20:16:00.
Operating System: Windows Vista (TM) Home Basic


Processes terminated by Rkill or while it was running:

C:\Users\Tere\AppData\Local\Temp\RtkBtMnt.exe
C:\Windows\System32\InfDefaultInstall.exe
C:\Windows\system32\runonce.exe
C:\Windows\System32\grpconv.exe
.exe


Rkill completed on 02/17/2011 at 20:16:18.



i was told that C:\Users\Tere\AppData\Local\Temp\RtkBtMnt.exe is a rootkit. does anyone know for sure?

i tried running hijackthis but it says i need to give it administrative rights, but the options the "run as administrator" is grayed out

im worried because earlier today i saw one of those fake programs that look like a virus scanner that tell you to you have viruses and a fake scanner pops up. i shut down my computer right away without touching anything but now im worried im infected,

Please familiarize yourself with the forum rules: >Forum Posting Rules - Please Read<

In order for us to help you it is necessary that you provide us with a HijackThis log. Please follow the instructions for your particular operating system, Windows Vista, at the link below. Start a new topic and post your HijackThis log by pasting it into your post. Do not utilize attachments.

This topic is now closed. Please start a new topic by following the HijackThis Guideline posted here: >Guideline for posting your HijackThis log<