Possible Duplicate:
For a PC with 1GB RAM, should I install 32 Bit or 64 Bit Windows 7?
Can I install 64 bit Windows 7 or 8 on system with 3gb ram ? Its a laptop with Core2Duo processor .
Possible Duplicate:
For a PC with 1GB RAM, should I install 32 Bit or 64 Bit Windows 7?
Can I install 64 bit Windows 7 or 8 on system with 3gb ram ? Its a laptop with Core2Duo processor .
Yes. All Core 2 Duo CPUs support 64-bit. From Wikipedia:
Intel Core 2 (including Mobile processors since "Merom")
From the Microsoft minimum specs, you'll need at least 2GB, which you have. You might notice a modest performance increase from 64 bit, but it won't be huge.
Of course, the more RAM, the better!