Corrupt file blocks Windows 7 startup

[Quattro]

I use Windows 7 operating system in my desktop computer, it was up and running till yesterday , but later on I had installed a couple of games and an application program , since then I think some of the system file has been corrupted and it does not allow my system to have startup , as my system shows a lot of issues while start up , but I am not able to isolate what is the core and root cause for this issue , I hope after posting the question I will able to help myself till some extent .

[Zhankana_n]

Well as you said that after you had installed the game and some application program , you got this issue , so for this reason it is very important for you to get rid of the game or the utility that is causing your system in startup failure .so I will ask you go into the safe mode if you can , once you go into the safe mode , I will ask you tor remove all the games and applications you have installed recently. Then check your system performance again.

[mesterio]

Well if you are able to get access in the safe mode then you can follow the above given procedure , but if you are not able to boot through safe mode then I will ask there is a possibility that your system is infected with a virus , so you will have get rid of the Virus , but since you can cannot do it ,if you have a dual boot system then you can boot it from the other operating system if not through the Windows 7 and then run a scan.

[Ernesto4]

Well it is indeed a virus attack , as I am know that any of the three files that you have brought in your system recently has acted as a carrier for the virus and the virus as directly attacked the system files, well in this case you do not have any choice but to reinstall the operating system , so you can either run Windows start up repair utility or you can reinstall the operating system again , once you have installed the operating system , I will ask you to get the installation cd and reisntall the operating system again.