Morox

I am in a crappy situation here. I split up with my girlfriend recently and prior to that, I took the hard drive from her computer and planned on putting it into mine (we only wanted one desktop in our household). I never did get around to putting it into my computer and now that we have parted ways, she wants her computer back. So, I took her hard drive and placed it back into her computer and when I try to start it up, I get this message:

Windows could not start because the following file is missing or corrupt:
<Windows root> \sytsem32\hall.dll.

Please re-install a copy of the above.

So yeah, I have no idea what's going on here. Her hard drive worked perfectly fine before and I never played around with cables or knocked any loose or anything. When I get into the BIOS, it still recognizes the hard drive. Also, I tried putting the hard drive into my computer (I tested this once and it worked fine) and I get the same message. Any idea on what to do? Here's her specs:

Dell Desktop 2400 (Pentium 4 2.66GHz, 512MB RAM, 80GB HDD, XP Home)

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Processor: Intel Core 2 Duo E6600@ 2.4ghz
Graphic Card: Evga Geforce 7950gt KO Superclock
Ram: Elixir 2048
Motherboard: Msi 975x Platinum motherboard
Monitor: Samsung 22" widescreen LCD