Update for anyone who may have similar question.
A friend recommended I assign a fixed size to the page file. As I understand it this should do away with the need to degrag. According to the article I was reading, the figures for PC which has 2GB of ram (which mine has) the page file size should be between 3072 and 4096. So I have set both the initial size and the Maximum size to 3072.
Just for good measure I downloaded and ran Perfect Disk, which took all night to defrag. This morning I also did the boot defrag, and can't honestly see any significant difference in performance/speed. Was it worth it?
Many thanks to all for your help!
