Ok, you have the right idea with speccy, but what you export should be pages & pages of data in that text file, not just the very simple specs. re-run speccy, and repost results.
press flag key and then R - type msconfig
select boot
select advance
check the box select the number of processors 2
select the max ram 4096KB
select apply
You should see about 3.xGB free after you get back into W7U64
Best you beef up the ram to 8GB to have about 7GB free when start-up.
Code:
Operating System
MS Windows 7 Ultimate 64-bit SP1
CPU
Intel Mobile Core 2 Duo T6600 @ 2.20GHz48 °C
Penryn 45nm Technology
RAM
4.00 GB Dual-Channel DDR3 @ 398MHz (6-6-6-15)
The minimum system requirements for Assassins Creed Revelations is 2GB memory. The recommended system memory is 4GB. This tells me that 3GB memory usage while playing Assassins Creed Revelations would not be out of the ordinary. I agree with the above post. You should bump it up your memory to 8GB for plenty of headroom.