Thank you gentlemen.
Downloaded Trendmicro. It cleaned a Malware worm and found 105 other corrupted files that it either cannot access or are non-cleanable. Trojans and worms.
Downloaded regmech21.exe. It found ten problems and the trial version fixed 8 of them.
Downloaded Mozilla - now working on how to run it as it didn't end up as a desktop icon. Rate me as rank amateur.