1. ihave dell-inspiron1525.may i update xp to windows7 or 8.if yes how can i?

  2. i cant view (cs5)psd files in thumpnails.how to view.

Don't do an upgrade. Do a complete re-install.

it's not update, it is actually upgrading..
For doing this, you need to get/buy windows 7/8 installation medium and instert disk.
then perform installation

thank u. i tried to install windows7. but the drivers of mylaptop inspiron1525 is not supporting. icame to xp.

If you go on the dell website and download all the vista 64bit or vista 32bit drivers depending on what windows7 install you do you will find that a majority of them will work.

I know this to be the case as I have done it many a time myself!

thank u. i tried to install windows7. but the drivers of mylaptop inspiron1525 is not supporting. icame to xp.

you need to download drivers for windows 7 from dell website.

there are none thats why Rix ,suggested the vista drivers

you need to download drivers for windows 7 from dell website.