virus attackd.a strainge problm,pls help

hi,
effected virus in my both pcs, tru my pen drive, wh i used to copy something frm a cyber cafe.

nw if i m trying to install antivirus(i tried AVG).it cant install,its just gtng skippd off.

and in my other pc,whn i m opening /checking virus check,with previously installed AVG, whn checking starting, after a few seconds,its automatically getting skipped of.

hw can i remove virus frm my pc and secure my datas?

pls help me. i m in need. if any antivirus is wt u,pls share

waiting to get solvd