|The link below shows system requirements. |
You want Windows to use system RAM before using the page file, which will be much slower.
The requirements do state that you need at least twice the virtual memory as system RAM. IMO that isn't much slack space on the hard drive. for best results your drive should have at least 20% free space and the partition should not be fragmented.
I didn't read all the requirements but there could be other issues when running on a laptop besides the amount of RAM and the virtual memory.