In regards to your inquiries, we have the following comments/suggestions:
1. "Is there a driver of DG33 for Windows 7?"
The only drivers available for boards based on the Intel(R) 3 Series Chipset Family, under Windows* 7, right now, are those found here:
Please, know "availability of Microsoft Windows 7 32-bit and 64-bit drivers may be limited for some Intel Desktop Boards. All board features (audio, video, LAN, etc.) may not be supported." (qtd. in http://www.intel.com/support/motherboards/desktop/sb/CS-008326.htm).
2. "I have a 32-Bit system. Can I Change it to 64-Bit by merely installing a 64-Bit Installaton CD or do I need to make any hardware changes?"
I confirm any of our Intel(R) 3 Series Chipset Family-based boards support both, Windows* XP 64-bit and Windows* Vista* 64-bit. No hardware changes are needed; just make sure the processor does support Intel(R) Extended Memory 64 Technology (EM64T):
Note: You can find the supported processor list here:
3. "I have 2 GB RAM,planning to add another 4GB but WinXP 32-Bit supports only 4GB. How to change to 64-Bit?"
See answer# 2 above. As for the Critical Driver Installation order for Windows* XP (32 or 64-bit), please, refer to the following URL: