Sometimes you will see your computer getting restarted or shutdown automatically without any instruction from your side. This is a frustrating scenario when you are working on some important stuff and your computer restarts without any notice. Of course this is an improper restart or shutdown and may damage your computer’s hardware like Hard Disk or may damage your Operating System like Windows. This is a common problem in old computers specially PCs i.e. computers running on Windows OS. But there may be different reasons for this common problem. Here are some of the reasons which may cause frequent auto restart or shutdown of your PC. I think this will help you (I think) in a way since we usually encounter this kind of problem. To solve this problem, you should follow below mentioned steps, Step 1. Change the CMOS battery on your motherboard Step 2. Clean the motherboard, Cable Slots of Hard disk, RAM Slots, CD Drive Slot etc inside the CPU box Step 3. Attach one more fan inside the box to exhaust the hot air from inside the box to outside Step 4. Install a good Anti-Virus program on your system and run full system scan. Checkout free versions of good Antivirus or Internet Security programs Top 12 Free Anti virus Programs Norton Internet Security 90 days free trial Step 5. In case your systems is still restarting frequently then go ahead and format the hard disk and install a fresh copy of operating system Now your computer should not restart even after running huge applications. But if your system is not having much RAM, then it is not recommended to install bulky applications like Adobe.