1. Install ovi suite or pc suite. make sure when pc suite connected it shows your phone in pc/ovi suite. if not showing then install the latest ovi or pc suite.
2. now if they are working well. disconnect your Cell from the data cable.
3. Now Kill Both Pc suite/ ovi suite in Windows Task manager.
4. Then start Nokia Screen Dumper (NSD).
5. connect your phone to cable. still PC/ovi suite will pop up in your phone with " Pc suite, mass storage". cancel all the option.
6. Now Click on the NSD. Choose File> connect.
7. a popup menu will come showing " Connection Ok". if this shows then all is right. else proceed with the "option 2" again.
8. NSD can take screenshot when phone is in not in standby mode.
Now Make your screenshot & Show us your theme Preview. Good Luck.