Hello

Please delete your Merkava folder and re-download Bot from:
And follow my instructions:
You should have installed latest version of Microsoft NET Framework,
link:

for 32-bit system ( x86)

for 64-bit system ( x64)
I would recommend to use CCleaner, latest version,
link:

Use this program and clean computer and registry.
After use CCleaner try run MerkavaBot :P
I think that this help you