Ok, that may be the problem from the Cpu-z report:
Coppermine Intel Pentium III EB Socket 370 FC-PGA (0x4) 0.18 um
Stock frequency 1000 MHz
Instructions sets MMX, SSE
Northbridge Intel i815/E/EP rev. B
Southbridge Intel 82801BA (ICH2) rev. 11
Memory Type SDRAM
Memory Size 512 MBytes
Memory Frequency 132.9 MHz (1:1)
Windows Version Microsoft Windows XP Professional Service Pack 3 (Build 2600)
DirectX Version 9.0c
Which version of Simlarity do I need for just old SSE?