I apologize in advance if this is a stupid question or raised earlier. While I did see people posting similar questions before, none of the answers could solve my problem. Would really appreciate your help.

Using Claymore's Dual Ethereum AMD+NVIDIA GPU Miner v9.4 to mine ether and encounter the following errors.

opencl error -61 cannot allocate big buffer for dag
opencl error -38 cannot write buffer for DAG

Here is my .bat file:

setx GPU_FORCE_64BIT_PTR 0
setx GPU_MAX_HEAP_SIZE 100
setx GPU_USE_SYNC_OBJECTS 1
setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_SINGLE_ALLOC_PERCENT 100
EthDcrMiner64.exe -epool us1.ethermine.org:14444 -ewal 0x41042a8eaec4f69fc902effe134b29577b0d70f0.Rig1 -epsw x

I have set my virtual memory to 16GB

and graphics card information:

AMD Radeon HD 7570
Total Available Graphics Memory: 4841 MB
Dedicated Video Memory: 1024 MB
System Video Memory: 0 MB
Share System Memory: 3817 MB

Any idea what went wrong? Thanks.