Programs disappear suddenly and no explanation

[Windows 7]

Hello. I have a computer with Windows 7 on it, which had an administrator password on it but I removed it and then installed some programs, then I went into the bios and it was set to ATA in the bios but I tried to set it to AHCI and it wouldn't boot into Windows after that, it kept giving me a blue screen, then the option to start Windows normally or "launch startup repair" and I gave it "launch startup repair", but that didn't work either, I think it tried to repair it but I don't think it succeeded, then I went into the bios again and changed from AHCI to ATA and it let me enter Windows on

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