wendykukulski.....Here's what I see in your post.....
You have a new vid card and WIN XP.......and when your p/c was in the shop , it was working fine. So you ake it home and all these strange things..........bad color , etc ,etc ,etc. Did you have just the tower in the shop. If so ...it was connected to a different monitor , keyboard and mouse.......If it worked fine there ......then it should work fine at home. Possibly your monitor is on its way out .....or you should uninstall your monitor and its drivers and let XP .....reinstall your monitor and drivers....
Win XP ......is in my opinion ( for what its worth ) is a way better than ME . Be sure to get all the updates . I would suggest downloading Sun Systems java instead of using MS virtual machine. ( very prone to hacking).
Then I would have Zone Alarm as a firewall.....It' free and works well..( spend a few minutes to read the tutorial on how to set it up so you dont get all the annoying popups.
I would also have AD-Aware ....also free and very good.
be sure to get the latest updates....and again read about it so you set it up correctly.
Then I would have SpyBot search and destroy...It also does a good job.....free as well. again read...read ....read ....read.
Last but not least ....A good up to date anti virus......I use Norton .....it is very resource intensive but does a good job.
Finally ......run these utilites regularly and you should be able to enjoy the internet. If you ignore them ....you can expect problems.The other thing is that once you know how to set them up to scan properly you may just never have to visit the computer shop again.
Good Luck
dl65