The process is pretty straight forward but makes sense to write it here in one Doc.
What we have to do is
We have to convert our vmdk files in a single one. We have many files called "Virtual Disk-s001.vmdk, Virtual Disk-s002.vmdk, etc..."
If we have ESXi5.5 we need to load first a module to allow us to work with this kind of files. Execute from the cli:
Now we can merge all the files into a new one:
When the process finishes we can create a new Virtual Machine as CENTOS 64 bits and use the existing DISK newesx.vmdk. Assign all the RAM and VCPUs you need and start the VM.
Hope this helps.