Restore core services folder

I fiddled in terminal with a sudo command to change the login background and then tried to change it by changing the default desktop jpeg in the core services folder. Neither worked as i ended up with a blue screen instead, my boot up time was also a lot slower. I tried to put it all back to normal and replaced everything where it should be but it didnt work.
I have tried many different things but nothng has worked. I tried reinstalling snow leopard but the problem is still there.
Asides from restoring to factory default and backing up my files, is there a way i can restore the core services folder to factory deafult again?
Can i do a disk repair using the snow leopard disk, would that work?

No, it's just repairing permissions and it doesn't require a backup, but I'd do one before you do anything so even if something goes wrong you still have your data. If it's the folder's contents that are messed up, though, it may not help much but it's worth a shot. I think if that doesn't work probably starting from scratch and putting your files back on would be the best option (i.e. completely deleting everything on the drive and reinstalling Snow Leo, but migrating just your apps and files, not the System folder). Anything in an invisible folder or in /System/, or /Library/, should be attended to with extreme care.
Anyone else have some input on this?

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