Get Laid Tips

i have an windows xp and ever since my bro started usin facebook on it , it recently said it was infected and my internet wudnt go to a website cus it say it may harm da comp, so we informed our internet company , comcast, and dey did somin and now my internet works but there is still malware on it, i can tell becuz sometimes my internet window will change to windows classic by itself and wont change back or my whole entire desktop will change to windows classic and wont change back to windows xp unless i restart my computer.and while on google i click a link it takes to me another website instead of da one im tryin to go to.websites like microsoft update will not open on my computer neither.. i already restored my computer bak to an earlier date but dat doesnt help…so can someone tell me how to get rid of da malware and im not a computer genius so you will have to break it down so i can understand you please and thank you : ] … ps my antivirus , avg, is no help neither
you sure Malwarebytes is ok to download because i have been scared to download anything on my computer lately. have you used it before?