Hello umairchang and welcome to Seven Forums. Not much info to go on but I'd try system restore to go back to a date/time prior to the problem starting. System Restore
If system restore doesn't work it would help if you told us what game it is and gave the specs for your computer as well as any other information like what you were doing just before the problem occurred. Just as an example: Did you install any other programs? Update anything? Suffer a power outage?