My PC at home stopped working yesterday and I feel so lost

. It is a bit old, and needs more memory inserted in the C drive, plus the virus checker and firewall packed in last night also. I had moved lots of files off the C drive to try to defragment it, hoping it would give a bit more memory, but what I've inadvertently done is delete some crucial files, and now even MS word won't work. I don't want to trust my baby to a stranger to fix, so am now trying to locate a friend who can sucessfully remove the virus (es), and upgrade the memory without loosing won't delete anything.
I feel quite isolated as a result of not being able to bhuz

, and no being able to check email (we can't at work).