oem version sould be able to install to the second pc

[Lima Chan]

If you purchased preinstalled version, it may looks cheap at that moment but
it won't let you installed to the second pc, not only that but you won't be
able to get the assistance direct from Microsoft, naturally if you have any
problem you have to deal with those ignorants which the manufacturer
provided(my case DELL). I recomend you purchase the upgrade version, which
you can take care both situations.

 

[Chris Schatte]

Lima Chan,
Actually you should do just a tad bit of research first before purchasing
Office software if you want to use a cheaper than retail version. Dell or who
ever is a reseller of the product.

That is why it is cheaper...

 

[Lanwench [MVP - Exchange]]

If you purchased preinstalled version, it may looks cheap at that
moment but it won't let you installed to the second pc, not only that
but you won't be able to get the assistance direct from Microsoft,
naturally if you have any problem you have to deal with those
ignorants which the manufacturer provided(my case DELL). I recomend
you purchase the upgrade version, which you can take care both
situations.

In addition to Chris' reply:
I believe you mean the *retail* version, not the upgrade version.