Numlock Please

I've been using Hyper-V for development work lately and it's been fine, just like any other hypervisor. However, there is one nagging issue, numlock gets disabled when jumping between guests. What the heck? I haven't experienced this behavior with KVM, VirtualBox or VMWare and it's really not worth figuring out the cause when PowerShell can keep your numlock enabled.

$objWord = New-Object -ComObject "Word.Application"
$wsh = New-Object -ComObject WScript.Shell
try {
while ($true) {
if (-not $objWord.NumLock) {
$wsh.SendKeys('{NUMLOCK}')
}
Start-Sleep -Seconds 1
}
}
catch {
# I know this is bad but I don't care.
}
finally {
$objWord.Quit()
Remove-Variable "wsh"
}