Hummm is right. Looks like we found the problem if those are the only files you have in that directory. I'm amazed anything is working for you. Compare your file listing to the one below. A file listing of the bin directory running on Windows Server 2003 w/ Plesk 7.0.3 should be something more like:
Directory of C:\Program Files\SWsoft\Plesk\admin\bin
02/02/2005 01:25 PM <DIR> .
02/02/2005 01:25 PM <DIR> ..
09/23/2004 04:18 PM 65,601 ab.exe
09/23/2004 04:17 PM 20,541 Apache.exe
09/23/2004 04:18 PM 41,042 ApacheMonitor.exe
12/16/2004 09:13 AM 196,608 backup.exe
10/26/2004 12:44 AM 16,384 bftest.exe
10/26/2004 12:44 AM 24,576 bntest.exe
10/26/2004 12:44 AM 16,384 casttest.exe
01/31/2005 10:35 PM 1,503 cert.cer
12/16/2004 08:53 AM 94,208 certmng.exe
12/16/2004 03:28 AM 151,552 CFMng.exe
12/16/2004 03:27 AM 131,072 CheckDns.exe
12/16/2004 03:26 AM 106,496 CheckPw.exe
12/16/2004 03:27 AM 102,400 ch_admin_email.exe
12/16/2004 08:53 AM 61,440 ch_mode.exe
12/16/2004 03:26 AM 90,112 Ch_MySQL_Charset.exe
12/16/2004 03:19 AM 122,880 ch_owner.exe
12/16/2004 03:30 AM 20,480 ClamAV.exe
01/16/2005 10:42 AM 623 clamav.InstallLog
01/16/2005 10:42 AM 5,015 clamav.InstallState
12/16/2004 03:21 AM 90,112 clamavmng.exe
12/16/2004 03:22 AM 159,744 clamavpackage.dll
12/16/2004 03:28 AM 61,440 client.exe
12/16/2004 08:53 AM 77,824 client_mailer.exe
12/16/2004 03:28 AM 61,440 client_pref.exe
12/16/2004 03:18 AM 118,784 copy_file.exe
12/16/2004 09:11 AM 16,384 crontabmng.exe
02/25/2002 10:16 AM 769,352 cygwin1.dll
09/23/2004 04:19 PM 8,960 dbmmanage.pl
12/16/2004 08:54 AM 94,208 defpackagemng.exe
10/26/2004 12:44 AM 24,576 destest.exe
10/26/2004 12:44 AM 16,384 dhtest.exe
12/16/2004 03:26 AM 163,840 DNSMng.exe
12/16/2004 03:28 AM 61,440 domain.exe
12/16/2004 08:52 AM 212,992 domainmng.exe
12/16/2004 09:15 AM 40,960 domain_bu.exe
12/16/2004 03:28 AM 61,440 domain_pref.exe
12/16/2004 03:20 AM 90,112 drwebmng.exe
12/16/2004 03:22 AM 110,592 drwebpackage.dll
10/26/2004 12:44 AM 16,384 dsatest.exe
10/26/2004 12:44 AM 36,864 ectest.exe
10/26/2004 12:44 AM 16,384 enginetest.exe
12/16/2004 03:27 AM 135,168 Enterprise_Query.exe
12/16/2004 03:13 AM 98,304 event_handler.exe
10/26/2004 12:44 AM 20,480 evp_test.exe
10/26/2004 12:44 AM 16,384 exptest.exe
12/16/2004 03:18 AM 233,472 filemng.exe
12/16/2004 08:54 AM 282,624 ftpmng.exe
12/16/2004 03:20 AM 90,112 get_dir_size.exe
12/16/2004 03:20 AM 12,800 get_ip.exe
12/16/2004 03:21 AM 49,152 get_mac.exe
10/26/2004 12:44 AM 16,384 hmactest.exe
09/23/2004 04:18 PM 77,892 htdbm.exe
09/23/2004 04:18 PM 69,703 htdigest.exe
09/23/2004 04:18 PM 77,895 htpasswd.exe
01/31/2005 10:36 PM 2,090 httpsd.pem
01/16/2005 10:31 AM <DIR> iconv
12/16/2004 09:15 AM 98,304 ICSharpCode.SharpZipLib.dll
10/26/2004 12:44 AM 16,384 ideatest.exe
12/16/2004 03:17 AM 159,744 ifmng.exe
03/25/2003 06:00 PM 32,768 Interop.Scripting.dll
03/25/2003 06:00 PM 32,768 interop.windowsinstaller.dll
12/16/2004 03:13 AM 81,920 key-writer.exe
09/23/2004 04:16 PM 122,952 libapr.dll
09/23/2004 04:16 PM 36,947 libapriconv.dll
09/23/2004 04:17 PM 168,017 libaprutil.dll
06/11/2003 04:49 PM 114,688 libcurl.dll
10/26/2004 12:44 AM 843,776 libeay32.dll
10/26/2004 12:44 AM 372,862 libeay32.exp
10/26/2004 12:44 AM 550,398 libeay32.lib
09/23/2004 04:17 PM 254,015 libhttpd.dll
02/02/2005 01:25 PM 0 list.txt
12/16/2004 08:52 AM 77,824 listmng.exe
12/16/2004 03:17 AM 98,304 list_files.exe
09/23/2004 04:18 PM 20,553 logresolve.exe
12/16/2004 08:52 AM 86,016 logrot_mng.exe
12/16/2004 03:28 AM 61,440 mail.exe
12/16/2004 08:52 AM 684,032 mailenableproviderw.dll
12/16/2004 08:52 AM 131,072 mailmng.exe
12/16/2004 08:52 AM 98,304 mchk.exe
10/26/2004 12:44 AM 16,384 md2test.exe
10/26/2004 12:44 AM 16,384 Md4test.exe
10/26/2004 12:44 AM 16,384 md5test.exe
10/26/2004 12:44 AM 16,384 mdc2test.exe
12/16/2004 08:54 AM 118,784 memailfilter.exe
12/16/2004 08:53 AM 143,360 merakmailfilter.dll
12/16/2004 03:02 AM 618,496 merakproviderw.dll
12/16/2004 08:53 AM 106,496 mssqlmng.exe
12/16/2004 09:17 AM 16,384 netmng.exe
12/16/2004 03:02 AM 43,520 nt2ux.dll
12/16/2004 03:28 AM 122,880 odbcmng.exe
10/26/2004 12:44 AM 278,528 openssl.exe
12/16/2004 08:53 AM 86,016 packagemng.exe
12/16/2004 08:54 AM 106,496 pdmng.exe
12/07/2004 11:50 PM 12,070 pfwmng.js
11/12/2003 08:23 AM 45,056 php.exe
02/19/2004 05:28 AM 1,269,760 php4ts.dll
12/16/2004 09:18 AM 24,576 pleskcore.dll
12/16/2004 09:18 AM 20,480 PleskService.dll
12/16/2004 08:52 AM 266,240 plesksrv.exe
12/16/2004 08:52 AM 53,248 plesksrvclient.exe
12/16/2004 03:28 AM 106,496 PopPassD.exe
12/16/2004 09:07 AM 242,688 psa-serv.exe
12/16/2004 09:18 AM 28,672 psa.firewall.config.dll
12/16/2004 03:29 AM 25,088 psa.firewall.device.dll
12/16/2004 09:18 AM 24,576 psa.firewall.service.exe
12/16/2004 04:19 AM 110,592 psa.ip.device.dll
12/16/2004 09:11 AM 57,344 psa.scheduler.device.dll
12/16/2004 09:11 AM 40,960 psa.scheduler.service.exe
07/16/2004 12:54 PM 547 psa.scheduler.service.exe.config
12/16/2004 09:15 AM 212,992 psabackup.dll
12/16/2004 09:15 AM 20,480 psabackupfile.dll
12/16/2004 09:18 AM 20,480 psacommon.dll
12/16/2004 09:18 AM 20,480 psainterfaces.dll
12/16/2004 09:14 AM 16,384 psamaillist.dll
12/16/2004 09:15 AM 16,384 psamailprovider.dll
12/16/2004 09:15 AM 1,519,616 psaobsolete.dll
10/26/2004 12:44 AM 16,384 randtest.exe
10/26/2004 12:44 AM 16,384 rc2test.exe
10/26/2004 12:44 AM 16,384 rc4test.exe
10/26/2004 12:44 AM 16,384 rc5test.exe
12/16/2004 03:27 AM 102,400 Reconfig.exe
12/16/2004 09:09 AM 299,008 reconfigurator.exe
12/16/2004 03:18 AM 143,360 remove_files.exe
12/16/2004 09:14 AM 430,080 restore.exe
10/26/2004 12:44 AM 16,384 rmdtest.exe
09/23/2004 04:18 PM 41,033 rotatelogs.exe
10/26/2004 12:44 AM 16,384 rsa_test.exe
12/16/2004 08:54 AM 143,360 sappmng.exe
09/13/1999 02:02 AM 90,624 sed.exe
10/26/2004 12:44 AM 16,384 sha1test.exe
10/26/2004 12:44 AM 16,384 shatest.exe
12/16/2004 03:19 AM 65,536 shutdown.exe
12/16/2004 03:26 AM 155,648 SkelMng.exe
12/16/2004 09:18 AM 28,672 SpamAssassin.dll
12/16/2004 09:18 AM 16,384 SpamAssassinService.exe
12/16/2004 09:18 AM 20,480 spamfilter.dll
12/16/2004 09:18 AM 24,576 spammng.exe
01/26/2004 08:06 PM 318 spammng.exe.config
10/26/2004 12:44 AM 159,744 SSLeay32.dll
10/26/2004 12:44 AM 31,481 SSLeay32.exp
10/26/2004 12:44 AM 46,846 SSLeay32.lib
10/26/2004 12:44 AM 28,672 ssltest.exe
12/16/2004 08:52 AM 372,736 statistics.exe
12/16/2004 08:53 AM 69,632 stunnelmng.exe
12/16/2004 03:28 AM 61,440 subdomain.exe
12/16/2004 08:54 AM 102,400 subdomainmng.exe
12/16/2004 08:53 AM 77,824 sysinfo.exe
12/16/2004 09:09 AM 102,400 timemng.exe
12/16/2004 08:53 AM 212,992 tomcatmng.exe
12/16/2004 08:53 AM 110,592 traymonitor.exe
09/14/2004 10:33 AM 2,487 ttsmailparse.php
05/19/2003 10:50 PM 194,560 UnRAR.exe
02/17/1997 08:50 AM 57,344 UNTGZ32.EXE
02/18/2002 07:56 AM 159,744 unzip.exe
12/16/2004 03:18 AM 208,896 usermng.exe
12/16/2004 03:21 AM 18,432 utils-lib.dll
12/16/2004 08:54 AM 258,048 vhostmng.exe
12/16/2004 08:54 AM 524,288 websrvmng.exe
09/23/2004 04:18 PM 20,555 wintty.exe
02/01/2005 12:00 AM 2,090 www_hgtech_net.crt
10/12/2003 02:47 PM 73,728 zlib.dll
11/18/2003 12:29 AM 55,808 zlib1.dll
161 File(s) 19,411,676 bytes
3 Dir(s) 75,792,891,904 bytes free
Is everything else working? Ie. The control panel, mysql, mailenable, etc? If the files you listed were the only ones in the directory, my question to you is - Did you keep good backups and do you have the stuff to reinstall Plesk? Or an even better question might be - Why did they suddenly disappear? Let me know whats missing and we'll se what we can do.
- Matt