Do not accept technical support phone calls from people you don't know.
There is a big scam about that involves people being called by fake technical support people. Accepting their advice may result in lost money and lost security of your PC.
The crooks cold-call people at home and claim to be calling from Microsoft or a well-known security firm and offering "free security checks".
See this link for more details of the scam.
Some websites have been behaving in the same way tricking folks into downloading expensive and bogus "Security programs" see for more details see this link.
For good advice on home internet security see books such as this.
Lets be safe out there.