Hacked browser

I cant connect to the symnatic servers when i got full reception and when i try to fill out an application form i always see to get to the end and an un expected error occurs and i lose all data that i have submitted or my internet connection breaks. so i decided to try and report the problem on the ic3.gov website and i cant even access the webpage unless its a cached copy!! have i got a virus or is my computer being controlled by a hacker?? any info on this and what i can do would be well apreciated its riving me insane!!