I currently own an Inspiron 1525. I am looking to upgrade the processor and memory. I already have the dimms sorted but was wondering about the cpu.

Mainly which cpu's would be compatible as the cooling of a laptop is limited.

The current cpu is an: Intel Core 2 Duo T5550 @ 1.83 GHz, 667 MHz FSB, 2Mb cache.

The ones which I am looking at are:

Intel Core 2 Duo Mobile T5850 ( http://www.cpu-world.com/sspec/SL/SLA4C.html )
or
Intel Core 2 Duo Mobile T7600 ( http://www.cpu-world.com/sspec/QO/QOJD.html )

I was wondering if anyone knew if they were compatible with my laptop. They have the same FSB, are the same socket but will the laptop be able to work properly?

Also can I use a processor with a faster FSB or will it not work well?
or
Could I use a Quad core processor instead?

And can I install window's 7 64bit as the processor's have EM64T tech (are 64 bit processors)?