All my System Restore points are corrupted?

I have a .dll which I use to http://www.eightforums.com/customization/24444-show-sort-headings-all-views-win-8-file-explorer.html

I recently had to reset my Internet Explorer settings to remove Conduit Search hijacker. This stopped explorer7fixes.dll from working in File Explorer, because it was loaded into IE as an 'addon'. Now I cannot get it to work no matter how much I unregister and re-register the Explorer7Fixes.1.0.0.2 version of the .dll, and this is even after restarting explorer.exe/restarting/shutting down.


System Restore fixed this problem for me the last time it happened (I restored back to a time when explorer7fixes.dll was working), but it appears that won't work this time as my restore points are corrupted. Gives the error code (0x81000201)

Can anyone help with this?

I managed to fix the .dll problem without needing System Restore (the way to fix it is to open CCleaner>Tools>Startup and enable Helper/Explorer7Fixes BHO Class. This will work even though there is no longer any record of the 'addon' in IE after resetting IE to default, say, if I get Conduit/Delta Search hijacker again.)

However I'm still worried that System Restore doesn't seem to work at the moment...