FReepmail
OK, so some general questions.
Do you have any new anti-virus or anti-malware software that wasn’t there before? If yes, can you get the one you previously had re-installed? (I use Windows Essentials. It’s free and gets good reports.)
Can you download and install software like Open Office normally?
Is there any other new software on the machine that wasn’t there before? Can you uninstall it?
Do you have a program like CCleaner to clean out your registry?
That’s enough homework for now.