[Theme CSS] bad visualisation of links font

Could you please clarify which links?

Bad’s a bit ambiguous, which browser, browser version and operating system is the problem occurring on?
Can you post links to screenshots of the issue?

Ok, I’m using default settings of WP.

WP on Chrome on a screen with resolution 1680×1050, OS WIN 7(in this case link look very bad)
https://dl.dropbox.com/u/90805329/1.png

Same Page on Chrome on a screen with resolution 1366×768, OS WIN 7 (here links font works fine) https://dl.dropbox.com/u/90805329/2.PNG

Thanks

The font being used is Helvetica Neue — which is not a Windows 7 font (according to various postings on the web) — so that may be part of the problem. Perhaps switch to another font for the menu — one that is web friendly or use Google fonts (or other equivalent).