Kindly do the following steps:
1] Uninstall PSoC Designer Manually
2] Remove Installed files-folders of PSoC Designer 5.1 (Default location: C:\Program Files\Cypress\PSoC Designer\5.1\)
3] Run the attached file("Rm-PSocDesignerRegKeysPD5.1.bat").
4] Download and install Adobe SVG viewer 3 (http://www.adobe.com/svg/viewer/install/auto/). Please open this webpage with IE4.0 or higher.
5] Download and install PSoC Designer 5.1 SP2 emergency patch from: http://www1.cypress.com/?rid=53393.