Upgrading from 32bit to 64bit

When I bought my new computer I ordered the 64bit version of windows vista
with it, but I received the 32bit. After I had phoned the company where I
bought my computer they talked me over keeping the 32bit version. But now I
want the 64 bit version after all.
On the Microsoft side I found the option to upgrade from 32bit to 64bit,
which would only cost me the shipping costs, but when I entered my licence
code but without any result. No updates possible. Is this because I have a
version of windows which comes with a new pc? (Got Vista Home Premium, dutch
version)

What's the cheapest way to get a legal 64bit verion of Windows Vista?

 

The problem is that the free 64-bit dvd is for purchasers of the retail
editions, not those whose Vista came preinstalled on a new machine (OEM).
When you buy Vista preinstalled you are only entitled to the version that
came installed on the computer unless your vendor agrees to provide both
versions (unlikely). If you want to migrate to x64 you will need to go the
retail route.

 

Colin has given you the bad news about OEM versions, I fear. But in addition
to that, I just want to be clear that there is no "upgrade" path - it needs
to be a fresh, clean, install. The 64-bit version of Windows Vista doesn't
support upgrades from 32-bit Windows, for fairly obvious reasons given the
change in architecture.

 

In addition to what Colin and Charlie have told you, there are probably very
good reasons why the "company" tech people talked you into keeping the 32
bit version. They are probably aware that their hardware does not support 64
bit Vista (lack of drivers, etc.) and don't want to deal with the issues.
If you plan to acquire a 64 bit version at your own expense, be sure to
check before hand for all needed 64 bit Vista drivers.