Games on pc suddenly running slow

Captaindomokun

Honorable
Nov 16, 2013
11
0
10,510
ive had a alienware pc for 6 months now, and up to now ive been running games at the highest settings, these games include borderlands 2 and bioshock which have been bought on steam

but today i started playing bioshock and everything was very slow and laggy, i changed the setting down to the lowest option but nothing seemed to work, i ran some scans for viruses and deleted unwanted programs but no difference

my pc has a intel 17 2.60 ghz, two ati radeon 5600 hd, 6gb of ram, a custom alienwre motherboard, 1.5 TB hard drive.

any help,advice or suggestions?