Thanks, y'all guys, you increased my confidence.
The local agent is ready to install Home Premium 64 bit on my system.....
and pump up the price to €4614 (From other European countries I get it for €2788 including VAT and shipping!
I'm hopefully counting on that their readiness to install 64 bit at a price definitely means that the laptop's got no problem running 64 bit.
what I can suggest is we shall get it with Vista Home and get you the Vista Ultimate 64 Bit separately since it does not come with the software from Dell and there is no option, the price of the Vista Ultimate 64 bit is € 189.00 vat inc. We can install it ourselves free of charge for you.
I can't even bring myself to send a decent reply.... "thank you but I can do that myself, also keeping the license for the 32bit OS rather than donating it to you, so that I could legally use it on another pc, or sell it... and probably even get a better price for Ultimate 64bit! Free installation my foot..."
I'm itching to reply but the poor local Dell sales rep was so kind and educated I don't have the heart to do it...