run a scan using anti-spyware or anti-malware program to remove the remnants. If there's no Add/Remove entry, just let the anti-malware program to remove it or use a manual method in removing it.
Manual method: http://www.kephyr.com/spywarescanner/library/mirartoolbar.winnb41/index.phtml
There are many variants of Mirar so it's best to use anti-spyware or anti-malware in removing Mirar.
Use any tools below to remove spyware/adware and other types of malware:
SUPERAntispyware (SAS) http://download.cnet.com/SuperAntiSpyware-Free-Edition/3000-8022_4-10523889.html
Malwarebytes Antimalware (MBAM) http://download.cnet.com/Malwarebytes-Anti-Malware/3000-8022_4-10804572.html
A2 Free (A2) http://download.cnet.com/A-squared-Free/3000-2239_4-10262215.html
How to Remove from browser mirar.