For example, CCleaner leaves these files among _many_ other files in my C:\documents and settings\Administrator\Local Settings\Temp directory:
Directory of C:\Documents and Settings\Administrator\Local Settings\Temp
01/11/2008 11:44 PM <DIR> .
01/11/2008 11:44 PM <DIR> ..
10/08/2007 08:29 AM <DIR> {AC76BA86-1033-0000-BA7E-000000000002}
03/30/2007 04:49 AM <DIR> 03300754628
03/30/2007 04:57 AM <DIR> 03300755259
11/30/2007 10:21 PM <DIR> 113007221918
01/09/2008 11:00 PM <DIR> Acrobat Distiller 7
11/21/2007 01:38 AM <DIR> Citi Virtual Account Numbers
01/05/2008 03:22 AM <DIR> eHelp
04/10/2007 10:15 PM <DIR> Excel8.0
04/11/2007 11:26 PM <DIR> is-411T6.tmp
04/11/2007 11:25 PM <DIR> is-AGNMH.tmp
06/04/2007 06:49 AM <DIR> MFPrint_PCL5c_2900
04/18/2007 09:00 PM <DIR> MFPrint_PCL5c_3792
01/10/2008 08:17 PM <DIR> moz_mapi
01/08/2008 12:07 AM <DIR> msohtml
01/08/2008 10:32 PM <DIR> msohtml1
11/11/2007 12:04 AM <DIR> NDP20-KB928365-v2-X86
11/21/2007 01:38 AM <DIR> oin1D16.tmp
10/04/2007 09:55 PM <DIR> pft1486~tmp
12/23/2007 10:25 AM <DIR> PK1D9.tmp
08/04/2007 09:47 PM <DIR> PK65A7.tmp
11/10/2007 02:30 AM <DIR> PK994.tmp
07/31/2007 10:50 PM <DIR> PKFA4.tmp
09/21/2007 11:59 PM <DIR> plugtmp-8
01/05/2008 02:54 AM <DIR> RegistryFixBackUp
03/19/2007 09:47 PM <DIR> VBE
05/12/2007 09:54 AM <DIR> Word8.0
01/11/2008 11:41 PM <DIR> WPDNSE
02/12/2007 03:08 PM 255,592 _is1392.tmp
02/12/2007 03:08 PM 255,592 _is1393.tmp
02/12/2007 03:08 PM 255,592 _is139E.tmp
10/08/2007 08:33 AM 16,384 ~DF1033.tmp
12/26/2007 02:45 AM 16,384 ~DF1148.tmp
04/18/2007 07:23 AM 16,384 ~DF1386.tmp
08/21/2007 07:17 AM 16,384 ~DF144D.tmp
12/18/2007 05:25 PM 16,384 ~DF152D.tmp
09/20/2007 10:33 PM 16,384 ~DF15B5.tmp
05/10/2007 12:10 AM 32,768 ~DF15FC.tmp
10/08/2007 12:04 AM 16,384 ~DF181.tmp
....50 files cut out here to save space
11/26/2007 10:49 PM 16,384 ~DFEF9D.tmp
10/17/2007 06:38 AM 16,384 ~DFF24D.tmp
10/31/2007 06:21 AM 16,384 ~DFF374.tmp
09/10/2007 07:55 PM 16,384 ~DFF672.tmp
09/29/2007 07:13 PM 98,304 ~DFF8FE.tmp
09/21/2007 10:55 PM 16,384 ~DFF946.tmp
04/11/2007 11:19 PM 16,384 ~DFF999.tmp
09/21/2007 11:06 PM 16,384 ~DFFD01.tmp
10/09/2007 09:42 PM 16,384 ~DFFE0D.tmp
10/07/2007 11:43 PM 16,384 ~DFFE81.tmp
11/13/2007 09:44 PM 512 ~DFFF.tmp
12/23/2007 12:00 PM 16,384 ~DFFFBD.tmp
05/05/2007 01:31 PM 1,020 ~ROMFN_000001B0
12/23/2007 10:22 AM 1,020 ~ROMFN_0000024C
11/11/2007 02:45 PM 1,020 ~ROMFN_00000370
01/11/2008 11:44 PM 1,020 ~ROMFN_00000564
12/23/2007 10:41 AM 1,020 ~ROMFN_00000920
12/28/2007 09:43 PM 1,020 ~ROMFN_00000B9C
08/08/2007 10:08 PM 16,000 ~WRD1898.doc
10/16/2007 11:28 PM 43,052 ~WRD2561.doc
10/15/2007 12:09 AM 43,052 ~WRD2581.doc
07/29/2007 12:44 PM 653 ~WRD2948.doc
08/08/2007 10:03 PM 16,000 ~WRD3595.doc
11/13/2007 10:07 PM 581 ~WRD4062.doc
07/13/2007 11:25 PM 49,152 ~WRF0000.tmp
04/21/2007 09:47 PM 147,456 ~WRF0001.tmp
05/28/2007 10:22 PM 49,152 ~WRF0002.tmp
07/29/2007 11:56 AM 98,304 ~WRF0003.tmp
07/31/2007 12:25 AM 98,304 ~WRF0004.tmp
07/31/2007 06:44 PM 98,304 ~WRF0005.tmp
08/08/2007 09:10 PM 98,304 ~WRF0006.tmp
08/08/2007 10:03 PM 114,688 ~WRF0007.tmp
08/11/2007 12:06 PM 114,688 ~WRF0739.tmp
10/14/2007 11:54 PM 131,072 ~WRF0816.tmp
10/03/2007 10:42 PM 114,688 ~WRF0975.tmp
10/03/2007 10:45 PM 114,688 ~WRF1273.tmp
10/16/2007 08:16 PM 147,456 ~WRF3360.tmp
04/21/2007 10:32 PM 3,399,168 ~WRS0000.tmp
05/28/2007 10:25 PM 5,676 ~WRS0001.tmp
07/29/2007 12:44 PM 55,530 ~WRS0004.tmp
07/14/2007 12:43 AM 21,524 ~WRS0005.tmp
10/16/2007 11:28 PM 303,104 ~WRS0913.tmp
08/08/2007 10:03 PM 3,124,224 ~WRS1249.tmp
10/03/2007 10:48 PM 36,352 ~WRS1310.tmp
10/03/2007 10:44 PM 28,160 ~WRS1599.tmp
08/08/2007 10:08 PM 1,105,926 ~WRS2275.tmp
07/31/2007 01:48 AM 135,180 ~WRS2430.tmp
10/15/2007 12:09 AM 231,426 ~WRS3079.tmp
09/09/2007 02:09 PM 796,170 001_1990_018.pdf
09/09/2007 02:00 PM 313,399 001_1990_021.pdf
07/29/2007 06:51 PM 4,351,500 001_DAS_tutorial_logit.pdf
08/12/2007 01:32 PM 278,858 001_gerstenblith_fm.pdf
08/01/2007 07:26 PM 154,132 001_PL107-279.pdf
08/13/2007 02:03 PM 96,620 001_seven_characteristics_life.pdf
08/08/2007 08:22 PM 59,036 001_v13n6.pdf
09/09/2007 02:00 PM 313,399 002_1990_021.pdf
11/10/2007 10:46 PM 1,142,336 11_interfaces_&_problem_solvers.pdf
08/13/2007 02:05 PM 31,842 110lectlifecharacteristicsoriginfall03.PDF
12/22/2007 06:01 PM 28,200 1383_appcompat.txt
10/21/2007 09:46 PM 138 15i2i5pu.url
11/10/2007 11:36 AM 103,776 1620_appcompat.txt
01/11/2008 02:01 AM 0 16g8o1me.lnk
12/25/2007 12:44 AM 28,200 17a4_appcompat.txt
12/23/2007 11:58 AM 28,200 1927_appcompat.txt
09/09/2007 02:06 PM 796,170 1990_018.pdf
09/09/2007 01:47 PM 313,399 1990_021.pdf
09/09/2007 02:12 PM 612,739 1990_034.pdf
10/28/2007 12:08 AM 103,602 1b8b_appcompat.txt
07/15/2007 11:34 PM 91,094 1c57_appcompat.txt
10/08/2007 12:06 AM 103,602 1ea3_appcompat.txt
12/17/2007 12:20 AM 31,172 1ec1_appcompat.txt
12/17/2007 12:20 AM 28,200 1f70_appcompat.txt
11/20/2007 09:05 PM 59 1-ringshout.ram
08/08/2007 07:53 PM 8,408 2006.1loveless.pdf
08/08/2007 07:57 PM 8,425 2006.1schneider.pdf
08/08/2007 08:00 PM 8,411 2006.1woessmann.pdf
12/04/2007 10:26 PM 35,124 20071127, Lessons Learned (TIMSS), Brookings.pdf
09/19/2007 07:25 PM 961,307 2007312.pdf
03/30/2007 04:48 AM 92,068 20ca_appcompat.txt
12/25/2007 03:22 AM 28,200 225c_appcompat.txt
07/27/2007 08:20 AM 91,094 247d_appcompat.txt
06/12/2007 07:33 PM 16,384 2496.tmp
06/12/2007 07:33 PM 16,384 2497.tmp
10/24/2007 01:12 AM 103,602 28ee_appcompat.txt
10/31/2007 10:03 AM 167 2A096472.TMP
12/26/2007 02:56 AM 28,200 2c69_appcompat.txt
09/22/2007 12:15 PM 91,966 2ed_appcompat.txt
08/12/2007 01:41 PM 302,080 2eqe83sq.doc
01/01/2008 01:08 AM 31,172 2f58_appcompat.txt
11/10/2007 11:36 AM 18,182 2ff8_appcompat.txt
11/20/2007 09:05 PM 54 2-home.ram
07/22/2007 11:26 AM 91,094 30_appcompat.txt
06/09/2007 10:20 AM 22,210 30070524, Citibank statement.pdf
11/10/2007 07:35 PM 103,776 304b_appcompat.txt
09/30/2007 12:38 AM 18,182 318e_appcompat.txt
10/07/2007 09:49 PM 28,240 325f_appcompat.txt
08/07/2007 10:20 PM 10,777 339.pdf
12/23/2007 12:02 PM 28,200 363e_appcompat.txt
07/22/2007 11:26 AM 18,182 365b_appcompat.txt
12/25/2007 01:12 AM 28,200 3825_appcompat.txt
10/07/2007 12:03 AM 125 3ebqytyx.ram.ram
11/20/2007 09:06 PM 59 3-fireflies.ram
11/20/2007 09:07 PM 59 3-fireflies-1.ram
11/20/2007 09:07 PM 59 3-fireflies-2.ram
10/10/2007 12:55 AM 103,602 400f_appcompat.txt
09/20/2007 10:31 PM 91,966 426_appcompat.txt
10/22/2007 11:27 PM 103,602 427_appcompat.txt
09/10/2007 07:19 AM 91,966 4963_appcompat.txt
08/21/2007 07:24 AM 91,966 4b03_appcompat.txt
10/08/2007 12:01 AM 18,182 4bc0_appcompat.txt
12/18/2007 08:04 PM 28,200 4bf2_appcompat.txt
10/23/2007 08:31 PM 257,196 4km403oc.pdf
12/25/2007 01:02 AM 28,868,320 4vbvpaoh.exe
09/20/2007 07:31 AM 18,182 5024_appcompat.txt
12/01/2007 11:22 PM 5,936,640 52b1e.msp
04/18/2007 07:21 AM 92,068 52d7_appcompat.txt
03/30/2007 03:28 AM 92,068 54ae_appcompat.txt
10/25/2007 10:52 PM 18,182 54d4_appcompat.txt
12/26/2007 02:27 AM 28,200 5704_appcompat.txt
...and so on. The list of files goes on.
CCleaner doesn't take these files out. I even Restarted to see if they would be taken out in a delayed action.
John Wirt