Hi my name is Sven. First of all, I'll give my system specs: Windows 7 Home Premium 64 bit Nvidia GeForce GTX 760 (version 340.52) Processor: Intel(R) Core(TM) i7-4770S CPU @ 3.10 GHz RAM: 8.00GB (7.89 available) DirectX runtime version: 11.0 A few days ago my computer worked just fine. I didn't download or install something new recently, just watched some videos, played some games and browsed the web.Then suddenly when I wanted started it again the day after, it took a long time to get to the welcome screen, the desktop was loading really slow and the task bar wasn't reacting properly. I have no internet connection whatsoever (it doesn't find any networks although it's connected with a cable). After some time, I can manage to use windows explorer but at random points it freezes again or stops working. Sometimes it even takes minutes to open the start menu. I began trying to find a solution by running CCleaner, scanning for registry errors, scanning for viruses or malware, and system repair, but none seemed to make things better. When trying a clean start up (without services), a few things happened and I had to restart a few times. One thing that happened is something I've encountered a number of times before: the restart proces freezing at the formation of the windows logo. The 4 dots start spinning but then freeze and I have to hard reset the computer to reboot. Then it always asks to choose between start up repair or a normal restart. If I chose normal restart, I got a blue screen of death that said something about a memory dump crash error (or something), I don't really know for sure since it only appeared on my screen for a few seconds. It asked to remove all hardware like sound devices etc. and reboot. When I did, the same happened all over again, the freeze at the windows logo, the hard reset, the blue screen. After that I chose system repair. I had to hard reset again because the computer froze at the window asking to start or cancel the repair (I didn't even had a mouse). The second time I could click it and watched the details of the start up repair, where I found an error named 0x45d. I also got a pop up from windows saying the current windows installed isn't legit and I had to reinstall it, even though it is legit I assure you. I have already asked for help on the malware forum of this site, and with the help of a malware annihilator (as the site calls him) I got to know my computer probably isn't infected with a virus or something (he said he didn't find anything malicious in the files I sent him) and he suggested asking for help on this forum. I have checked for dust in my computer, but since I don't know much about hardware I didn't remove anything to check for more dust, but I think the lot of it must be gone. I thought I could upload soms mini dump files, but there is only 1 inside the C:/windows/minidump map, and I can't upload it here because it says it has an extension that isn't allowed (.dmp) Hope someone can help me out!!