Dump most of the software inc. MacAffee and all the crappy games. Just go to add/remove programmes and delete from there. Download the following (all free)
1) Microsoft Security Essentials (anti virus) click here
2) Ccleaner click here
3) Klite mega codec pack click here
4) There seems to be some probs running 97 Office. Why not download the free Open Office which is similar to 97, 2000, 2003 and 2007 and will run all the same files... click here
5) stick on Spyware Terminator to protect against dodgy progs (the free version).... click here
6) check MS updates for the latest fixes etc.
7) Itunes is de rigueur for the younger generation....click here
2 hours and Bob's yer uncle.