Hi SemjonsKutin,
Thank you for posting the query on Microsoft Community.
I am sorry to know that you are getting explorer.exe error. Do not worry will assist you with the issue.
Try to Run SFC Scan.
Use the System File Checker tool to repair missing or corrupted system files:
http://support.microsoft.com/kb/929833
If issue persists, then try to run Microsoft Safety Scanner. It helps remove viruses, spyware, and other malicious software. It works with your existing antivirus software.
http://www.microsoft.com/security/scanner/en-us/default.aspx
Anti Virus Disclaimer : Any data files that are infected may only be cleaned by deleting the file entirely, which means there is a potential for data loss.
Hope this helps in resolving the issue. If issue persists, do get back to us. We will be happy to assist you.