Trying to upgrade Virtual PC 2007 for Win 7

I have a virtual pc 2007 w/ ms server 2003 on it and an app that i can't easily get replaced. i pasted the vpc onto my new Win7 desktop. it works, but unfortunately there's no intergration with the host pc w/ win7 on it. i'v downloaded x-mode and the new virtual-pc, which works fine, but the older virsion still won't intergrate. i've been trying to update the older version, but the update wizard keeps asking for "usbhub.sys". i've been scouring the internet looking for it, but i still can't locate it.

Any ideas as to what to do?

Thanks,
very cool idea.

I was able to create a new Virt_PC using the old .vhd file. I went into settings and enabled the integration features then shut down the computer and rebooted it. After rebooting, I was asked to upgrade the integration components. I declined to see if I could copy and paste into the new virt_pc. No luck.
So I went into tools and clicked the upgrade option. I get a Vert_pc Integration Component box and click next. It does its thing, then asks me to restart. After restarting, the same box reappears, with a message, "Supported OSs:-WinXP, WinVista, Win7." I click next, and I get a message telling me the mouse will be captured by the vert-pc machine. After I click ok, the mouse is trapped, and I have to hit ctrl+alt+delete to escape.
Next, I get a message that I need 'usbhub.sys' on Service Pack1 CD-ROM' to continue, with a request for a path to the file. When I look specifically for the 'usbhub.sys' online, I can't find it.

Any ideas?

To Continue:
When I try to access Integration Features again, they're unavailable. When I try to shut down, the vert pc only allows me to turn off or power down. And when I open it again, I'm stuck with a vert pc that has no integration with its host.

I've tried what you suggested and have ended up with a virtual pc that locks the cursor in the virtual window. I have to hit ctrl+alt+delete to get it to escape. Also, graphics seem to be effected - the screen is choppy.
After doing some research online, I've found that the new Window Virtual PC doesn't support Server 2003, so I think I'm out of luck.
If you have any other ideas, let me know.

Thanks for the help

Also,
when trying to install the updates, I received files need notices that prevent the installation of the integration components:

Program Files\virtual pc integration components \i386

I looked up the notice online and found that the new Windows Virtual PC only supports XP sp2 and up. So alas, it doesn't look too good for my Server 2003.

Thanks dude.