|Some malware makes it appear that your computer is severly contaminated, and sometimes it also hide things that are normally visible such as hard drive partitions other than C.|
Obviously if there was actually no data on C Windows would not work, the operating system would not load.
"I haved opened some website and attack virus"
That sounds like crap the maker of a "rogue" anti-malware program was responsible for contaminating that web site with.
I'm assuming you can see your Windows desktop screen fine, although there may be icons missing on it, and/or items missing from the Start menu that you normally see .
Malwarebytes will usually find the malware and get rid of all the symptoms.
See response 1:
Note that sometimes you can only install Malwarebytes in Safe mode - in that case, loading Safe mode with networking is required in order for it to be able to update itself.
Ignore the part about loading your latest System Restore restore point unless you did what the guy in that Topic said he did in the first post - loaded a previous restore point.
DO NOT turn off System Restore BEFORE removing malware.
See the last part of response 3:
starting at "By the way, ..."