Today I started task manager and saw this process syshost ............ i tried to end the program message poped-up that unable to terminate the program ...then i went to it's location which is C:\Windows\Installer\{A4D6E64C-F511-4F97-F321-32B8D1F5A2D1} ............ i tried to delete it and message poped up that the file is too long or something ..... researched on this file on inter net and saw many articles saying that it's a trojan and opens back door for many hackers ..... and for cure they are saying to download softwares like Malwarebytes(present in my PC) and Spy HUnter4 etc etc.......... but non of them worked .....is there any solution for this or i have to format the PC ... i have windows 7