My pc restarts itself unexpectedly

[Guest Festus1001]

My pc restarts itself when I try to install or uninstall anything from programs to updates. I have tried everything I can think of to fix it and have read many threads on here about random shutdowns but no solutions seem to help. My pc started doing this a few days ago when I turned it on. After about 2-3 minutes it restarted itself. I didn't think anything of it until it did it everytime windows started. I thought it might be malware and started up in safe mode where this problem didn't occur. I conducted many scans using AVG and Malwarebytes they didn't find anything and the problem wasn't fixed so I thought maybe a system restore would fix whatever was going on. It seemed to fix the issue and I could use my computer without it shutting down. The next day I turned on my computer and I encountered the same problem and so I downloaded the malicious software removal tool and this detected a trojan which I removed. I started up windows normally to see if It had fixed the problem. It hadn't. I then read that a dodgy AVG update was crippling windows 7 64-bit systems so I uninstalled AVG hoping that maybe that was the problem this fixed the restarting after 2 minutes issue. I have since downloaded avast but I have discovered that I cannot install or uninstall anything, as I have said, without my computer restarting also I have noticed that my physical memory usage is different to when my pc was fine. Now there is hardly any free memory it is all on standby and before there was also no modified memory but now there is. Not sure if that is normal or not? I also tried dusting my computer and unpluging and replugging the power cord. Also my computer becomes loud at times when It is not doing any stressful tasks that would warrant that sort of noise.

 

All of this is really confusing I am not sure if malware still exists on my pc and that's what's causing the issue or if it's something else. Any help would be greatly appreciated.

 

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