Using OS Selector, 1st OS now gets HAL.DLL error; 2nd still boots; how to fix?

Has been working fine for some time (even after moving OS Selector to it's own small partition at end of drive)... but but suddenly yesterday, trying to boot into the original OS in OS Selector, getting the missing / corrupt hal.dll error message... how to fix?

 

Verify that the properties for each OS are still correct (correct booting partition, correct Active partition, etc.).

Verify that the boot.ini settings (if XP) are correct for the entry. Do this by looking at the file from the OSS OS's menu entry properties, not from the file on the partition.

 

Thanks, this fixed it. I was able to view the boot.ini file of the OS that I couldn't boot to, from within the OS Selector, which I hadn't realized I could do; it was in fact empty, and I simply retyped the content.