[Inkscape-user] Problem adding fonts

Hi list, I am running Inkscape 0.42.2 on a Windows XP Pro machine and encountered a strange problem. I did not notice if I was able to successfully add fonts earlier but yesterday I tried to add some and failed to access them trough Inkscape. However, I was able to use some other fonts I remember I installed earlier. Those new fonts I installed yesterday were also available in other graphics programmes I use too. So I searched for the font cache file and deleted it, restarted Inkscape but nothing seemed to have changed, deleted again but the problem persisted. Now, I do not know what to do. Please help me!