Hello SPUD1: I am glad you did not ring that number.
It may have been ok but i rang one very similar ,and oh they were good they offered to look into your computer but once in they come up with an outragious excuse to bill you .
I not saying it is them but be safe. I think they called them selves ( TECH GUYS ) SOMETHING LIKE THAT.
I WILL tell you what iv'e done and that is contact MICROSOFT THEMSELVES AND FOR AN ANNUAL SUBSCRIPTION OF £75 YOUR COMPUTER ALL MICRO-SOFT PROGRAMMES THE LOT IS COVERED ,and the best thing they do NOT contact you .
YOU CONTACT THEM . WORTH an enquiry, Hope things work out!