Step 1
Log on as an administrator
click START in the search programs and files type REGEDIT
(ensure all hives or expanded Hkeys in the left pane are contracted)
You should therefore only see
Computer
HKEY_CLASSES_ROOT
HKEY_CURRENT_USER
HKEY_LOCAL_MACHINE
HKEY_USERS
HKEY_CURRENT_CONFIG
in the left pane and nothing in the right
step 2
with Computer highlighted in the left pane click File>Export
and select an appropriate drive (not system drive ) to store your current registry settings. give it a name you can recognise.
Step 3
Click Edit on the File Menu Bar
then Find > (in the Find What box, type "Blekko")
make sure under the look at box
all the boxes are ticked
do not put a tick in "Match whole string only"
Press return
delete every instance that shows Blekko
until the end of the registry search.
Step 4
Close the registry editor
at this stage before you reboot you should repeat step 1
This would then save a registry without BLEKKO entries.
now REBOOT
Before going back on the internet ensure any browser you're using has all references to Blekko removed
as search engines or anything else.