S.M.!!! My PC has done that for months but it's back on track for the most part. I think you may need a new modem if you have dial up. ..but if it's Broadband,I have no idea. Again,in dial up,it could also be your program. Maybe you need to upgrade.
Do a system check if possible for people trying to hack through with spyware. That was part of my trouble. Hope I helped,good luck!
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"A knight of the road,going back to a place where he might get warm."
- Borderstone