So you have multiple PCs and the problem only happens on one PC? Could you please provide more details about the problem? Which folder you tried to load? Is it a local folder, or a network folder? Also please email us a screenshot of the crash screen.
Note the new Online Backup 4.0 has two components: one is the GUI applications, which you use to create, edit and manage tasks; the other component is the backupService.exe process, which runs in the background and actually gets your files backed up.
With Online Backup 4.0, you can log off your computer or quit the GUI application; the backup service process will continue running (You must be a premium member).
In your particular case, the error might be caused by some corrupted backup task info file. You can delete all cached settings / files and try again from the scratch. To delete all DriveHQ Online Backup cached settings / files, please find this folder:
C:\Documents and Settings\Default User\Application Data\DriveHQ\GlobalData\
Delete the above folder. Then find the folder:
C:\Documents and Settings\Default User\Application Data\DriveHQ\DriveHQ Online Backup\
Keep the file PCInfo.dat and delete all other files and folders in the above folder;
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If you upgraded from Version 3.8, please also find the folder:
C:\Documents and Settings\YOUR_WINDOW_USERNAME\Application Data\DriveHQ\GlobalData\
and delete the above folder and all files / folders in it; then find the folder:
C:\Documents and Settings\Default User\Application Data\DriveHQ\DriveHQ Online Backup\
Keep the file PCInfo.dat and delete all other files and folders in the above folder.
Once you have done so, please restart your PC and try again.