Superuser installed, No Root Access

[tempuser1]

Hello androidcentral members,

It seems that I accidentally changed the ownership of the su file to "system, sdcard_rw" and now I have no way to change it back to "root, root". Everything was working fine beforehand. Any suggestions on how to fix the su file? I have already attempted to reroot using the same way I originally rooted the device and hard reset with no luck.

Thanks!

My phone information
Phone: LG Optimus Slider
Android version: 2.3.4
Carrier: Virgin Mobile

 

[tempuser1]

Can anyone please help me with this?
I have also tried using the LG Mobile Support Tool recovery option, but it fails after it downloads its files.