With that litte RAM on a Windows 7 installation, I think it is time to speed Windows up.
Stop the indexing and other hungry processes.

Google for; How to speed Windows 7 up.

CPU looks good, RAM is on the very low side.

That said, I ran PoserPro2010 on 2 different 10" netbooks, one on XP the other on Windows 7 starter.
OK, render time was slow due to a N270 and a N450 CPU and with only 1GB RAM.
But he pose room stayed fluent.

Update Windows, clean Windows7, update PoserPro to SR1.

Use :
CCleaner = free
Glary Utilities = free
Advanced Syste Care free (version 4 I think now), to get your system up to speed.

Poser 1, 2, 3, 4, 5, 7, P8 and PPro2010, P9 and PP2012, P10 and PP2014 Game Dev
"Do not drive faster then your angel can fly"!