Same here. I am using Intel i5 2500K with integrated GPU, and no OpenCL. It is not for serious mining, just for experimenting. Why cgminer call themselves CPU/GPU miner, if they in fact demand a GPU to run on CPU. Strange logic, IMHO.

100 digging shovels will not compete with a single big digging machine. Big copper mines squeeze the small ones. A matter of efficiency which comes out of large scale and superior tecnology.
In the context of bitcoins, we already see the trend towards hotter and hotter gear. Well, cooling systems can be made more efficient with bigger, dedicated systems.

Thanks Xephan, will try - it is just a toy for me.
P.S. have mentioned Ufasoft in my #3 post here.

As johnyj wrote above, a mid-range gear will mine about $50/month, if electricity cost is taken into account. That is not insignificant, but it can hardly be considered as making a living. Nice toy, though.
It is quite obvious that "small" miners (like CPU miners) will soon be squeezed out to leave the playground for super-duper, liquid nitrogen cooling system, large computers. This can be expected, if the demand for bitcoins grows. It is simpy a matter of the economy of scale - like in conventional mining for, say, copper.
That isn't quite compatible with the decentralization concept of the bitcoin itself.

As I wrote above, Ufasoft CPU miner used to work quite well (about 8 Mhash/sec for 2 threads) with the deepbit pool, but it recently stopped working (while I have changed nothing). This is a known, acknowledged issue. The error code: 80190191. So, I am now experimenting with other CPU miners, not many of them left.

To avoid more confusion:
Again, my system is i5 2500K with GPU integrated with CPU, not running OpenGL. No separate video card is present, hence - only a CPU mining is possible.
So, why should I install an OpenGL if I can't use it in the first place?
I would have expected the following logic by cgminer: if no OpenGL is found - enable CPU mining only. If it is found - follow the input script parameters to enable either GPU or CPU mining.
No rocket science here.

OK, here is what I get when I try running my bat file that opens the CGminer exe, and links it to my pool:

System error: The program can't start because OpenGl.dll is missing from your computer

Indeed, it is better to call it an initiation problem, rather than install problem.

No confusion here, just a problem with the CGminer installation for CPU use only, as in my case of no separate GPU card and no OpenGL. It seems that the present installation is mainly for GPU mining with the CPU mining just on option, provided CGminer found the OpenGL first, to enable it to install.
I know that OpenGL could be installed separately, but at this moment, a much simpler solution of disabling the need of detecting the OpenGL at CGminer installation for CPU mining only, looks much more elegant.

CPU mining on Ufasoft or CpuMiner on win7-64, intel i5-2500K:
8 or 5 Mhash with 2 threads

I know that GPU mining can be about 100 times faster than CPU, but my system, i5 2500k, doesn't need a separate video card, and I am not yet into serious mining to add one. I am just experimenting.
Ufasoft CPU miner used to work quite well (about 8 Mhash/sec for 2 threads), but it recently stopped working with the deepbit pool.

Have tried to install CGminer to try it for CPU mining only. My system (i5 2500k, integrated GPU, Win7 - 64) doesn't support OpenGL. Installation demands OpenGL, although CPU mining does not use it.
Any idea about avoiding this problem?
Thanks