Hi Nikhil,
If you wish to completely remove TDM and it's components, with intention to never use again:
From the control panel, select Programs / Uninstall :
CA Test Data Manager Portal
FastDataMasker
GT - Test Data on Demand
GT ALM Batch
GTDatamaker
GTPortusJobProcessor
GTRallyBatch
GTRemotePublish
GTEDI
GT Group Job Executor
GT HP ALM Service
GTServer
Javelin
TestDataVisualizer
Search to see if there are any other programs from Publisher Grid-Tools or CA Technologies, remove if applicable.
From the directories, by default - however your installation path may vary.
C:\Program Files\CA\*
C:\Program Files\Grid-Tools\*
C:\Grid-Tools\*