When I boot from Windows 7 it shows 64 bit , otherwise it shows 32 bit. What to

Hello tilakjha;

You have a dual boot system. And it's not a problem having a 32bit Windows and 64bit Windows on the same system.
It's actually kind of a good thing to have a choice.
My vote would be 'leave as is'.

Yes you could still boot from the Vista32 CD.
And you should make yourself a Win7 Repair CD, and one for Vista as well.

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AS WR2 says - having duel boot is not an issue - but the problem you will have is that the Win 7 is just a trial... so after 30 days it will stop working and start nagging you to pay for the full version.

So certainly dont uninstall your Vista 32

So do as intended - trial the Win 7.... if you like it and upgrade - you can then uninstall your Vista (or leave it if you like WR2's advice, but remember - if you "upgrade" to Win 7 - you will not be licenced to have both on your system)... but if you dont like it - or dont want to pay to upgrade... you can uninstall the Win 7 at the end of the trial and carry on with your Vista 32.

HTH
Cheers

For anyone that's interested in dual booting - some guides:
Dual Boot Installation with Windows 7 and XP
Dual Boot Installation with Windows 7 and Vista
Dual Boot Windows 7 and Ubuntu

Hi  

There is NO win7 trial..what you have is win7 with no key.....

We are not allowed to assist people with illegal software here....

All the best Brett