Cannot get Boot Manager launch WinXPsp2

[dario.schiavon at fastwebnet.it]

Hi!

I've always been using MS Windows. Even if I've very little experience with
Unix-like systems, I've installed FreeBSD 5.3, because I want to learn it
and see if I can use it for some tasks.

Since, in any case, I can't abandon Windows (which I'm so used to...), I
installed the FreeBSD Boot Manager. After the installation process I'm not
able to launch Windows any more.

After the power-on self test, what I suppose to be the boot manager appears:
 F1   ??
 F2   FreeBSD
 F5   Drive 1
 Default: F2

If I'm not making mistakes, F5 will look for a boot manager on the other
hard disk (I have ad0 with both OSes, and ad1), so F1 should start Windows.
But I get this error message:
 Errore di lettura da disco
 Premere CTRL+ALT+CANC per riavviare
which means:
 Disk read error
 Press CTRL+ALT+DEL to reboot
Which is likely to be Windows' loader complaining for something unknown to
me.

What did I mistake? How can I get both OSes to boot as expected?
FreeBSD boots correctly, so I tried to make sysinstall reinstall the boot
manager, but it complains:
 ERROR: Unable to write data to disk ad0!
 Disk partition write returned an error status!

Please help me! I need Windows working as soon as possible...

Just one more question: I have an ASUS A7N8X-E Deluxe motherboard, which
has two ethernet devices. I got the Marvell Yukon Gigabit Ethernet card successfully
identified as sk0. Which module should I load to get the integrated MCP-T
NVIDIA MAC fast ethernet card (which should be part of the nForce2 chipset,
I think) working?

Thank you!
-Dario