Try this Sir: (skip the things you've already done)
1. Run (Start but. + R) --- msconfig
- go to Services Tab
- check - [✓] Hide all Microsoft Services
- Find the Sandboxie Service on the remaining list and check if its "status" is "running". If it is, uncheck it.
- go to Startup Tab
- Uncheck Sanboxie related programs
- Restart PC and check if it removed your problem. If not, go to the next step.
2. Uninstall then remove the remaining files and folders
- Uninstall
- go to your main Drive [ex. C:\] and delete the Sandbox folder
- run "regedit" as administrator
- you have to find most sandboxie related registry
- you can do so by pressing "ctrl+F" and type "sandboxie"
- if it finds a registry with "sandboxie", Press Delete [on keyboard] immediately.
- after delete, just press [F3] to find the other registries, then delete also find another. [just delete all registry that has sandboxie with it]
- Restart PC and check if it removed your problem. If not, go to the next step because it might be a virus. [or not]
3. If the above for-mentioned steps didn't work don't fret.
- only do this if you already uninstalled and rebooted your PC but the File keeps on running still on startup
- open Task Manager
- go to Processes tab
- select the [UNWANTED] program
- [Right Click] the program
- Select [Properties]
- check the location [ex. C:\blah blah\bleh bleh]
- open the location
- Delete the [suspicious] file
- [If it can't be deleted go to next step]
- [now you have to be a bit fast doing this]
- select the [UNWANTED] program on task manager, then [Right Click], then select [END PROCESS TREE]
- now quickly go back to the Folder and delete the [suspicious] file
- if it's still cant be Deleted, try following this tutorial to delete it ->
Delete Protected File <-
- Reboot PC and check if it worked
These are some of the Simple methods to help for you problem, try them, if none worked I'll give some more methods for you to follow.
Hope it helped