qBittorrent official forums

Qb. 2.9.7 worked previously until Advanced SystemCare 5 ran 'Deep Clean'

ASC5 Log Extracts mentioning Qb.:

Deleted HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\MenuOrder\Start Menu\Programs\qBittorrent
Deleted HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\App Management\ARPCache\qbittorrent
END ASC5 LOG REFERENCING Qb.


Launch/Error Log c/o AnVir Task Manager:

06/10 05:44:05 qbittorrent.exe 4652 started by explorer.exe C:\Program Files\qBittorrent\qbittorrent.exe
06/10 05:44:24 python.exe 5004 started by qbittorrent.exe C:\Python32\python.exe --version
06/10 05:45:57 WerFault.exe 4364 started by qbittorrent.exe C:\WINDOWS\System32\WerFault.exe -u -p 4652 -s 2148
06/10 05:46:06 window created by WerFault.exe Microsoft Windows
06/10 05:46:28 WerFault.exe 4364 terminated, worked 0:31, CPU 0:01 C:\WINDOWS\System32\WerFault.exe
06/10 05:46:30 qbittorrent.exe 4652 terminated, worked 2:29, CPU 1:11 C:\Program Files\qBittorrent\qbittorrent.exe
06/10 05:46:48 SearchProtocolHost.exe 5764 terminated, worked 31:31, CPU 0:10 C:\WINDOWS\System32\SearchProtocolHost.exe
06/10 05:46:48 SearchFilterHost.exe 1764 terminated, worked 3:16, CPU 0:00 C:\WINDOWS\System32\SearchFilterHost.exe
06/10 05:46:52 SearchProtocolHost.exe 2132 started by SearchIndexer.exe NT AUTHORITY\SYSTEM C:\WINDOWS\System32\SearchProtocolHost.exe Global\UsGthrFltPipeMssGthrPipe43_ Global\UsGthrCtrlFltPipeMssGthrPipe43 1 -2147483646 "Software\Microsoft\Windows Search" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT; MS Search 4.0 Robot)" "C:\ProgramData\Microsoft\Search\Data\Temp\usgthrsvc" "DownLevelDaemon"
06/10 05:46:52 SearchFilterHost.exe 1388 started by SearchIndexer.exe NT AUTHORITY\SYSTEM C:\WINDOWS\System32\SearchFilterHost.exe 0 656 660 668 65536 664
06/10 05:47:19 wmpnscfg.exe 3444 started by explorer.exe C:\Program Files\Windows Media Player\wmpnscfg.exe
06/10 05:47:20 wmpnscfg.exe 3444 terminated, CPU 0:00 C:\Program Files\Windows Media Player\wmpnscfg.exe
06/10 05:47:26 wmpnscfg.exe 2636 started by explorer.exe
06/10 05:47:26 wmpnscfg.exe 2636 terminated, CPU 0:00 wmpnscfg.exe

END LOG

Uninstalled/Reinstalled 2.9.7 with same results Launch Failure

Attachment.
Pirform Speccy System Summary: Actual User Name changed to UserName

Deinstall qBittorrent, delete C:\Users\"your_user"\AppData\Roaming\qBittorrent and C:\Users\"your_user"\AppData\Local\qBittorrent (first copy the folder BT_backup), run registry cleaning with CCleaner, install qBittorrent again.

Followed directions, Clean functional installation, qb blank, missing torrents, shutdown qb, copied contents of BT_backup to C:\Users\"your_user"\AppData\Local\qBittorrent\BT_backup, restarted qb, same fail on launch error, looked at files in BT_backup, 1 files was strange, it had no size info (attached), moved same file out of BT_backup, restarted qb., qb ran like a Champ, faster than it ever had ran before, Thanks for the assit., Much appreciated, E

Very strange. I had never seen 0 kB .fastresume file. Maybe your cleaning software is "cleaned" the file somehow, who knows. There is always some risk such a program to cause a mess. But i'm glad to see that you solved your problem. Btw i prefer to clean the system with the above mentioned CCleaner and no problem so far.