Cheat Engine

[iGod]

Does stuff stored on the HD effect the proformance of the computer?

[Saifallofjmr]

Viruses: Yes
Fragmented fles: Yes

So the answer is yes.

[iGod]

No, I mean like if i download flash but not run it will it affect my proformance?

[Karakawe]

Unless it causes the disk to become fragmented, as larger files tend to do, just having the files shouldn't impact performance. People should have defrags scheduled more often than they do anyway.