Uninstall Winamp? I mean if it indeed is causing such an issue to affect other software.
In general, software won't cause errors in other software. if winamp is using a high amount of cpu then the whole system would have less cpu to use, so c2 would be slower.
If software does cause issues in other software then it's either abusing system settings or it's virus ridden.
That's just my thoughts. I don't use Winamp, but since it's to play music, it should not affect other software at all.