It sounds wrong that it "immediately comes back" with nothing found. The scan takes at least a few minutes on my systems. To me, it sounds like it is not recognizing the USB port as something to scan at that point. Have you looked at your BIOS settings and pay special attention to anything USB related? (especially anything "legacy USB"). Maybe try in a different USB port (ie. maybe not a USB3 port).
I don't know if there are any requirements about which folder the drivers should be in. I place mine in the root of the USB in a folder called "drivers", then separate out by motherboard/computer model (and I have both 32 and 64-bit drivers mixed up in there).
For example:
F:\>f:
F:\>cd drivers
F:\drivers>dir /s
Volume in drive F is WHS-RESTORE Volume Serial Number is 48FB-A7FE
Directory of F:\drivers
07/03/2011 06:47 PM <DIR> . 07/03/2011 06:47 PM <DIR> .. 07/03/2011 06:48 PM <DIR> hp_dv4-2153cl 04/17/2012 07:32 PM <DIR> dh67cf 0 File(s) 0 bytes
Directory of F:\drivers\hp_dv4-2153cl
07/03/2011 06:48 PM <DIR> . 07/03/2011 06:48 PM <DIR> .. 07/03/2011 06:47 PM <DIR> net 0 File(s) 0 bytes
Directory of F:\drivers\hp_dv4-2153cl\net
07/03/2011 06:48 PM <DIR> . 07/03/2011 06:48 PM <DIR> .. 07/03/2011 06:47 PM <DIR> 32 07/03/2011 06:47 PM <DIR> 64 0 File(s) 0 bytes
Directory of F:\drivers\hp_dv4-2153cl\net\32
07/03/2011 06:48 PM <DIR> . 07/03/2011 06:48 PM <DIR> .. 12/23/2008 11:47 AM 151 note.txt 11/06/2009 01:05 PM 351,492 rt86win7.cat 11/06/2009 06:32 PM 829,242 rt86win7.inf 11/05/2009 10:14 PM 230,912 rt86win7.sys 03/05/2009 02:54 PM 73,728 RtNicprop32.DLL 07/22/2009 06:24 PM 94,208 RTNUninst32.dll 6 File(s) 1,579,733 bytes
Directory of F:\drivers\hp_dv4-2153cl\net\64
07/03/2011 06:48 PM <DIR> . 07/03/2011 06:48 PM <DIR> .. 12/23/2008 11:47 AM 151 note.txt 11/06/2009 01:05 PM 351,505 rt64win7.cat 11/06/2009 06:36 PM 829,264 rt64win7.inf 11/05/2009 10:15 PM 291,328 rt64win7.sys 03/05/2009 02:54 PM 67,584 RtNicprop64.DLL 07/22/2009 06:24 PM 97,792 RTNUninst64.dll 6 File(s) 1,637,624 bytes
Directory of F:\drivers\dh67cf
04/17/2012 07:32 PM <DIR> . 04/17/2012 07:32 PM <DIR> .. 04/17/2012 09:42 PM <DIR> 32 04/17/2012 09:42 PM <DIR> 64 0 File(s) 0 bytes
Directory of F:\drivers\dh67cf\32
04/17/2012 09:42 PM <DIR> . 04/17/2012 09:42 PM <DIR> .. 04/17/2012 06:34 PM <DIR> e1c6232.inf_x86_neutral_e5591de1ee0be352 0 File(s) 0 bytes
Directory of F:\drivers\dh67cf\32\e1c6232.inf_x86_neutral_e5591de1ee0be352
04/17/2012 09:44 PM <DIR> . 04/17/2012 09:44 PM <DIR> .. 03/20/2012 10:55 PM 10,100 e1c6232.cat 01/06/2012 02:02 PM 3,109 e1c6232.din 03/15/2012 08:58 PM 84,919 e1c6232.inf 04/11/2012 04:59 PM 95,960 e1c6232.PNF 03/15/2012 08:54 PM 392,872 e1c6232.sys 02/17/2012 02:52 AM 72,360 e1cmsg.dll 05/26/2009 10:05 AM 28,792 NicCo36.dll 02/03/2012 03:07 AM 82,624 NicInstC.dll 8 File(s) 770,736 bytes
Directory of F:\drivers\dh67cf\64
04/17/2012 09:42 PM <DIR> . 04/17/2012 09:42 PM <DIR> .. 04/17/2012 12:15 AM <DIR> e1c62x64.inf_amd64_neutral_6761ee61676f4903 0 File(s) 0 bytes
Directory of F:\drivers\dh67cf\64\e1c62x64.inf_amd64_neutral_6761ee61676f4903
04/17/2012 09:46 PM <DIR> . 04/17/2012 09:46 PM <DIR> .. 03/20/2012 10:55 PM 10,138 e1c62x64.cat 01/06/2012 02:02 PM 3,114 e1c62x64.din 03/15/2012 08:58 PM 88,289 e1c62x64.inf 04/12/2012 09:00 AM 98,600 e1c62x64.PNF 03/15/2012 08:57 PM 514,736 e1c62x64.sys 02/17/2012 02:52 AM 72,360 e1cmsg.dll 05/26/2009 10:05 AM 36,472 NicCo36.dll 02/03/2012 03:07 AM 99,520 NicInstC.dll 8 File(s) 923,229 bytes
Total Files Listed: 28 File(s) 4,911,322 bytes 29 Dir(s) 3,497,033,728 bytes free
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