Ok, I tried the scan and it generated this:
System Manufacturer: DIXONSXP
System Model: Ei 205A
Motherboard Manufacturer: DIXONSXP
Motherboard Model: P4M900-8237A
Maximum Memory Capacity: 1048576 MB
Currently Installed Memory: 512 MB
Available Memory Slots: 1
Total Memory Slots: 2
Dual Channel Support: N.A.
CPU Manufacturer: GenuineIntel
CPU Family: Intel® Celeron® D CPU 3.33GHz Model 6, Stepping 5
CPU Speed: 3326 MHz
It says the maximum memory capacity is 1048576mb which I think is a gigabyte, but on my motherboards specifications it says the maximum capacity is 2 gigabytes per slot, so what is actually capable of going into one slot? By the way I'm pretty sure that my system was an OEM type, so does that mean if I change system parts Vista will stop working? Many thanks.