is it possible to run this miner on a 2gb ram on the pc?
i dont believe it is.
whats the solution then?should i again buy 16gb ram?
I use 4GB RAM in my rigs. 2GB is too small, it will fail on most configurations, there is no way to fix it.
yes but give it a try, it can be successful
i run this: windows7 64bit, 1Gb ram, 2xhd5870(1Gb vram), catalyst 13.12

it works. 376h/s for 2 hd5870 as expected
(the cpu is also mining and two wallet are stacking at the same time!)
i have another rig with 2Gb and 3xhd7950. it works too.
whats your secret?Should i fresh install win7 x64 after downgrading from 16gb?
no secret, perhaps a little of luck!
the hardware is very old (gygabyte g31 motherboard, pentium e5200 and 40gb ide hdd). gpu 0 is an asus hd5870@950/1250 1gb and gpu 1 a vtx hd5870@920/1200 1gb too.
the rig ran under pimp (groestl much of the time) but ~3 weeks ago, i decided to test cryptonote.
so i set up windows 7 integral 64bit but for faster install, i put 2gb memory. i chose catalyst 13.12 and claymore v5.0. i did not test newer driver (hardware too old to hope better performances)
the rig was OK and i was able to mine succesfully some ducknote.
later, i replace the 2gb ram (top of the range kingston ddr2 memory that i sold a good price) by cheaper 1gb ram noname. the rig is still working at same performance.
this hardware will wait a little before going to the trash can

thanks Claymore.