两只小蜜蜂dj:[求助]怎么把光驱设置第一启动?看了别人的,不一样!?求谢了!

机子速度慢了,想必有病毒.想重新装,对于我个新手实在难,以前都是叫人来装的,所以下决心来向高手请教.

我在这里附上启动按"DEL"进入的界面介绍等等,详细点.
如果有高人懂得或知道此类系统操作方法,请务必执教,谢谢了!
小弟就20分,刚有的号,有了在送!再谢
注:我想让机子彻底刷新,别的盘如果有病毒,需要格式化吗?

进入-有5个大选项
Main Advanced Power BOOt Exit(注:别人装我记是BOOT)
进入BOOT项-①△Boot Device Prierity
②△Boot Settings configuration
③△Security
进入-①△Boot Device Prierity有3个分选项
1ST Boot Device [PM-ST3120022A]
2ND Boot Device [SM-HL-DT-STDVD-ROM]
3RD Boot Device [1ST Floppy Drive]
进入②△Boot Settings configuration有10个分选项
Quick boot
Full Screen Logo
Addon ROM Display Mode
Bootup Num-Lock
PS/2 Mouse Support
Typematic Rate
Boot To OS/2
Wait For 'F1' IF Error
Hit 'DEL' Message Display
Interrupt 19 Capture
进入③△Security有4个分选项
Change Superoisor Password
Change User Password
Clear User Password
Boot Sector Virus Protection