Leo says that something is taking up a great deal of RAM and it's causing the computer to labor hard and slow down. "Services" are just things running in the background. He can examine what services are running to get an idea of what's slowing down his computer by right clicking on "My Computer", then click "Manage", and click the "Services" tab. This will show him a list of all the services that are running. Windows may also be indexing the computer at bad times.
Leo says that netbooks are very cheaply built for a reason, they’re cheaply priced. However, Leo advises removing the RAM and re-seating it to see if that fixes it. But he can also remove the RAM and replace it with the old sticks. If that fixes the issue, he'll know the new RAM is defective.
Leo says the Intel Core 2 Duo is much faster, ten times as fast as the Pentium. He's also wondering if 8GB of 667MHz RAM would be better than 4GB of 800MHz RAM. Leo says to make sure the motherboard supports both, which it does. In this case because 4GB is sufficient, he would go with the faster 4GB RAM.
This is because Alan is using a 32 bit OS, and with some of the RAM reserved for computer itself, that’s all it can see. If he wants to see all 4GB of RAM, then he needs a 64 bit OS.