My pc's issues:
Properties will not show for anything (desktop, folders, my computer)
It will not find any usb-connected devices (external hard drives, usb sticks, phones, tablets, etc.)
It will not play sound, and says there is something wrong with my sound card configuration, and when I look for my sound card, it says it doesn't exist.
It will not run regedit (says it doesn't exist)
Also, in my explorer, it now shows a window without text with a heading saying Microsoft .NET Framework. The box contains two red crosses: one left, and one right. The one on the left, when clicked, gives an extended menu with details about just-in-time (JIT) debugging. - this seems to be solved by closing the extra address bar I had installed
In general, the biggest problem is probably me having been deleting important files in the cleaning of my computer (and I hadn't made a backup) <-- I definitely regret this.
Also, I have deleted most of windows programs (like MS Word and MS Powerpoint) I think this would also be solved if I just re-installed windows, so I believe the easiest option is to completely reset my computer and wipe everything from my hard disk(s), but I don't know how to do that.
My pc specs:
Operating system: Microsoft Windows XP Professional SP3(5. 1, Build 2600)
Processor: Intel® Pentium® 4 CPU 2.40GHz
Memory: 1024MB RAM
Temporary memory: 171MB used, 2291MB available
DirectX-version: DirectX 9.0c (4.09.0000.0904)
Any advise would be appreciated