Can't require ruby gems on windows 10 - ruby

Question

I have installed ruby -v 2.2.4 (64x) on Windows 10 from it's official website. The setup completed successfully, but ruby isn't able to require gems. Whenever I run the following command from IRB:
require 'minitest'
It fails with the output:
LoadError: cannot load such file --
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in
'require'
from C:/Ruby22-x64/lib/ruby/2.2.0/rubygems/core_ext/kernel_require.rb:54:in
'require'
from (irb):1
from C:/Ruby22-x64/bin/irb:11:in '< main>'
Gem list:
bigdecimal (1.2.6)
io-console (0.4.3)
json (1.8.1)
minitest (5.4.3)
power_assert (0.2.2)
psych (2.0.8)
rake (10.4.2)
rdoc (4.2.0)
test-unit (3.0.8)
RubyGems Environment:
- RUBYGEMS VERSION: 2.4.5.1
- RUBY VERSION: 2.2.4 (2015-12-16 patchlevel 230) [i386-mingw32]
- INSTALLATION DIRECTORY: C:/Ruby22/lib/ruby/gems/2.2.0
- RUBY EXECUTABLE: C:/Ruby22/bin/ruby.exe
- EXECUTABLE DIRECTORY: C:/Ruby22/bin
- SPEC CACHE DIRECTORY: C:/Users/alexl/.gem/specs
- SYSTEM CONFIGURATION DIRECTORY: C:/ProgramData
- RUBYGEMS PLATFORMS:
- ruby
- x86-mingw32
- GEM PATHS:
- C:/Ruby22/lib/ruby/gems/2.2.0
- C:/Users/alexl/.gem/ruby/2.2.0
- GEM CONFIGURATION:
- :update_sources => true
- :verbose => true
- :backtrace => false
- :bulk_threshold => 1000
- REMOTE SOURCES:
- https://rubygems.org/
- SHELL PATH:
- C:\Users\alexl\bin
- C:\Program Files\Git\mingw64\bin
- C:\Program Files\Git\usr\local\bin
- C:\Program Files\Git\usr\bin
- C:\Program Files\Git\usr\bin
- C:\Program Files\Git\mingw64\bin
- C:\Program Files\Git\usr\bin
- C:\Users\alexl\bin
- C:\ProgramData\Oracle\Java\javapath
- C:\Windows\system32
- C:\Windows
- C:\Windows\System32\Wbem
- C:\Windows\System32\WindowsPowerShell\v1.0
- C:\Program Files (x86)\Skype\Phone
- C:\HashiCorp\Vagrant\bin
- C:\Program Files (x86)\EaseUS\Todo Backup\bin
- C:\wamp\bin\php\php5.6.15
- C:\ProgramData\ComposerSetup\bin
- C:\Ruby22\bin
- C:\Users\alexl\AppData\Local\atom\bin
- C:\Program Files\Git\usr\bin\vendor_perl
- C:\Program Files\Git\usr\bin\core_perl
I have googled around for some time, but could not find any useful information about resolving this issue.
Edit 1
I have uninstalled the x64 version and installed the x86 one. The error still persists