I'm sorry but you simply haven't given us enough information so we can help
you with focused troubleshooting advice. Please answer these questions:
The First Question Of Troubleshooting: If the problem is new, what changed
between the time things worked and the time they didn't?
The Second Question of Windows Troubleshooting: what is the malware/virus
status of the machine? If you think it is clean, what programs (and
versions) did you use to determine this?