I am running win 7.
I was getting poor results as well from my system until I had updated card that I was using.
I had a ati 4350 that got me through for the past 2 years or so.
I started the mining over the weekend.
I singed up at Mining.bitpool.
I am also using the Guiminer.
My CPU was at 20M or so
My GPU was around 5.
I went from the 4350 to my brand new 5870.
My GPU is now 300M +
My CPU is also running 60 as well.
The old card is short and stubby.
My new card is a Monster. 1 Foot long and 3 times wide.